Why Do Borderlines Hurt the Ones They Love? A Therapist’s Guide to the Push-Pull Dynamic

THERAPY TOPICS • March 19, 2026

Last reviewed: June 2026 by Annie Wright, LMFT

2:47 in the Morning, and the Phone Won’t Stop

In my work with driven women over 15 years, particularly those healing from disorganized attachment and high-conflict relational trauma, I’ve seen a specific moment repeat itself with enough regularity that I’ve come to recognize it before the client even finishes describing it. It usually starts around 2 or 3 in the morning.

Priya was 39 when she first sat across from me, still holding her phone like evidence. It was a Tuesday in January, winter light barely beginning at the window, a half-empty Nalgene bottle with a peeling sticker from her last trail run sitting on the table between us. She’d been awake since 2:47 a.m. The messages from her husband had started shortly after midnight. Tender. Then alarmed. Then accusatory. Then silent for forty-five minutes. Then devastating.

“He told me he’d never loved anyone the way he loved me,” she said, voice almost steady. “That was at dinner. By midnight he was sending me screenshots of our old texts trying to prove I’d always been pulling away from him. By two in the morning he was saying maybe we’d made a mistake getting married.” She pressed her fingers against her eyes. “And I keep thinking, what did I do? What did I miss at dinner?”

She hadn’t missed anything. That’s what I remember feeling, sitting with her. The particular ache of watching someone search her own history for a fault that isn’t there.

What Priya was living inside is the push-pull dynamic. And the question she couldn’t stop asking, the one that had kept her awake for months before she made this appointment, is the same question that brings most partners and family members of people with borderline personality disorder into my office: why do they hurt the people they love most?

The answer isn’t simple. But it is knowable. And knowing it changes things.

All client vignettes in this post are composite portraits. Names, identifying details, and circumstances have been changed to protect confidentiality.

This content is psychoeducational in nature and is not a substitute for professional mental health treatment. If you’re in crisis or concerned about your safety, please contact the 988 Suicide and Crisis Lifeline by calling or texting 988.

What Is the BPD Push-Pull Dynamic?

The BPD push-pull dynamic is the oscillating pattern of intense idealization followed by sudden devaluation that governs close relationships when one partner has borderline personality disorder. It’s not unpredictability for its own sake. It’s a nervous system cycling through two survival states, closeness and danger, that it hasn’t yet learned to hold simultaneously.

The push half of the cycle is what most people notice first: the pulling away, the accusations, the sudden coldness or rage. But the pull is equally powerful and often gets less clinical attention. In the idealization phase, the person with BPD experiences their partner or family member as essential, as the only person who truly understands, as the answer to a lifelong hunger. That intensity is real. It’s not manipulation. It’s the emotional experience of someone whose attachment system is permanently set to the most sensitive register.

What shifts between idealization and devaluation is perception. A delayed text, a distracted look, a tone that registers below conscious awareness as a signal of abandonment. The threat doesn’t have to be real. It only has to be perceived. And once abandonment terror activates, the prefrontal cortex, the part of the brain that holds nuance and context, goes offline. All that remains is the body’s emergency response: fight, run, or collapse the relationship before it collapses you.

Understanding this doesn’t make the behavior acceptable. Partners and family members who absorb the devaluation phase bear real psychological costs. But understanding the mechanism is what creates the first point of exit from taking it personally in the ways that most corrode a sense of self.

Why Does Abandonment Terror Drive the Push-Pull?

Abandonment terror, the specific physiological panic activated by perceived relational loss, sits at the center of borderline personality disorder and is the engine behind the push-pull cycle. At its most acute, it doesn’t feel like fear of being left. It feels like annihilation.

For most people, a partner’s distraction during dinner registers as a mildly frustrating moment. For someone with BPD, the same moment can register as the beginning of the end. The amygdala, the brain’s threat-detection center, fires as if a real danger is present. Stress hormones flood the system. The reasoning center goes quiet. What remains is a body screaming that it needs to act now, before the loss arrives.

The research linking BPD to childhood trauma is consistent. A 2020 meta-analysis published in the journal Psychological Medicine (Winsper et al., 2020) found that adverse childhood experiences, including emotional neglect, inconsistent caregiving, and early relational trauma, are among the strongest predictors of BPD development. The abandonment terror isn’t invented. It was learned. The nervous system experienced real abandonment early enough that the detection system never had the chance to recalibrate.

This is where I often see a shift in clients who love someone with BPD. Not a reduction in their own pain. Not permission to stay in a harmful situation. But a different relationship to the confusion. When you understand that the devaluation is the nervous system’s emergency protocol, not a verdict on your worth, something settles. The question stops being “what did I do wrong” and starts being “what does this person’s nervous system still believe about safety?”

Of course you’re exhausted by it. Holding space for someone whose threat-detection system fires at everything you do is its own relentless kind of work. That exhaustion is legitimate and it deserves to be named.

How Does Splitting Explain the Overnight Villain Switch?

One of the most disorienting aspects of the push-pull dynamic is how completely the person with BPD’s perception can shift. Not just their mood. Their actual assessment of who you are. You can go from being their safest person to being the reason everything has gone wrong in the space of one conversation. The clinical mechanism behind this is called splitting, and understanding it is, in my experience, the piece that brings the most immediate relief to partners and family members.

Judith Herman, MD, Clinical Professor of Psychiatry at Harvard Medical School and author of Trauma and Recovery, describes how early caregivers who were simultaneously nurturing and threatening create fragmented internal representations of self and other. The child who had to love a parent who was sometimes safe and sometimes dangerous learns to hold those two versions entirely separately. The coping strategy that helped them survive becomes, in adulthood, the defense that makes sustained intimacy genuinely difficult.

For partners, splitting produces a specific and painful disorientation. You aren’t experiencing the normal variation in a relationship where someone is sometimes warm and sometimes cold. You’re experiencing a complete perceptual reset. And because the shift happens so quickly and so completely, many partners begin to doubt their own sense of reality. If they see you so differently now, were they right before, or are they right now? Which version is true?

Neither version is the full truth. And working with a therapist who understands this can help you hold that distinction when the relationship makes it almost impossible to.

What Does the Push-Pull Dynamic Look Like Day to Day?

The push-pull dynamic in BPD relationships follows a recognizable cycle, though the timing, triggers, and intensity vary significantly from one relationship to the next. Understanding the structure of the cycle is different from experiencing it. In my clinical practice, I’ve found that naming each phase clearly is one of the first things that helps partners and family members stop feeling like they’re going insane.

The cycle typically moves through idealization, threat activation, devaluation, rupture, and repair. The idealization phase can last hours, days, or months. During this phase, the person with BPD experiences their partner as essential, irreplaceable, profoundly understood. They pursue intensely, love generously, and create the kind of closeness that can feel more intimate than anything the partner has ever experienced. This is real. Don’t let anyone tell you the connection wasn’t genuine.

Then something shifts. A delayed response. A tone of voice. A moment of ordinary human distraction that registers, below the threshold of conscious processing, as a signal of abandonment. The threat doesn’t have to be real. It needs only to be perceived. And once abandonment terror activates, the idealization collapses into devaluation, sometimes within the same phone call. For a deeper look at when love registers as threat, the neuroscience is worth understanding directly.

Leila is a 41-year-old surgeon whose younger sister has been formally diagnosed with BPD since her mid-twenties. She’s been navigating the push-pull dynamic from inside the family system for nearly two decades. “The thing nobody prepares you for,” she told me, “is the speed of it. I can be talking to her on the phone, and it’s fine, it’s warm, she’s calling to tell me about her day. And then I say something like ‘I can’t talk long tonight, I have an early surgery.’ And it’s like a switch flips. I become someone who has never loved her. Someone who abandoned her. Someone who never really cared.” Leila twisted the signet ring on her right hand as she described it, something she’d done through every hard conversation in her adult life. “And I know, intellectually, what’s happening. I’ve read the literature. But at 10 p.m. on a Thursday when I have to be in the OR at 5:30 a.m., it still lands like an accusation.”

The rupture phase, when the devaluation peaks into active conflict or withdrawal, is exhausting. But it’s the repair phase that creates the most durable psychological hook. When the person with BPD cycles back to closeness after a rupture, the relief is genuine and intense. Patrick Carnes, PhD, psychologist and researcher at the Meadows treatment center, has documented how intermittent reinforcement creates some of the most powerful and persistent attachment bonds humans form (Carnes, 2019). The nervous system doesn’t just endure the cycle. Over time, it organizes around it.

This is why leaving is so much harder than it appears from the outside. It isn’t about not knowing the relationship causes harm. Most partners and family members know. The attachment itself, structured by the push-pull and deepened by the repair cycles, is genuinely difficult to exit. And the attempt to leave often activates the person with BPD’s most intense abandonment terror, which can produce the most frightening behavior, which makes the exit feel even more dangerous. If you’re navigating a BPD relationship cycle, you don’t have to do this analysis alone.

How Does the Nervous System Get Organized Around the Cycle?

Partners and family members of people with BPD don’t just experience stress in the relationship. Over time, their own nervous systems reorganize around the relational pattern. This is one of the most underreported aspects of BPD dynamics, and it’s where I see some of the most significant psychological injury in the people who sit across from me.

In my clinical work, I consistently observe a specific progression. Initially, the partner or family member registers the push-pull as confusing but not yet destabilizing. They’re trying to understand it, to find the variable they can control. Over months and years, the hypervigilance that comes from living with an unpredictable relational environment begins to reorganize their baseline. Their nervous system, shaped by thousands of moments of unexpected rupture, begins to run on a low-grade threat-detection setting even when things are calm.

Stephen Porges, PhD, developmental psychophysiologist and creator of Polyvagal Theory, describes neuroception as the way the autonomic nervous system continuously evaluates safety below conscious awareness (Porges, 2011). In relationships structured by intermittent threat, neuroception stops trusting calm. The body learns that calm is temporary. That something is coming. And it stays braced.

What this looks like in a person’s daily life: difficulty concentrating at work because part of the mind is always monitoring for the next rupture. Trouble sleeping, especially in the hours after a conflict or an unexpectedly warm interaction. An erosion of the ability to trust one’s own perceptions. Many of the clients I work with who’ve been in long-term BPD dynamics describe a specific internal experience: they’ve stopped trusting what they remember. “He told me that conversation didn’t happen,” Priya said in one of our sessions. “And for a while, I actually wondered if he was right.”

That erosion of self, the gradual adoption of the person with BPD’s reality over your own, is among the most significant psychological injuries that can occur in these relationships. It doesn’t happen through any single event. It happens through repetition: hundreds of moments where your perception was contradicted, your memory was challenged, your instincts were overridden. In BPD dynamics, this often isn’t intentional in the way gaslighting is sometimes framed. The person with BPD may genuinely not remember the conversation the way you do, because their emotional flooding affects encoding and recall. But the effect on the partner is the same: a slow, corrosive loss of confidence in one’s own mind.

Recovering that confidence is real work. It doesn’t happen through understanding alone. It requires a relational context, specifically therapy, where your perceptions are consistently treated as credible. Where someone helps you remember how to trust what you know.

Both/And: Emotional Intensity Is Both a Wound and a Capacity

Borderline personality disorder is one of the most stigmatized diagnoses in mental health. And one of the most fundamentally misunderstood. The driven women I work with who carry this diagnosis, or who love someone who does, often find themselves trapped between two oversimplified narratives: clinical language that pathologizes, and internet commentary that demonizes. Both miss the full human being.

Both/And means we refuse to simplify what isn’t simple.

For the person with BPD, the emotional intensity that drives so much of the pain is also, genuinely, a form of capacity. People with BPD often feel more deeply, connect more passionately, and love with more complete commitment than almost anyone. The same sensitivity that makes the push-pull dynamic so exhausting for partners makes people with BPD capable of extraordinary creativity, empathy, and relational depth, when the nervous system is regulated enough to access those capacities.

The intense emotional experiences were a wound once. And they are also now costing you. Both truths are real.

For partners and family members, Both/And means something different but equally necessary. You can hold compassion for the other person’s suffering and still prioritize your own safety. You can understand the neurobiological underpinnings of the push-pull dynamic and still hold that person accountable for their behavior. You can love someone with a personality disorder and set limits that the person with the disorder experiences as rejection. None of these truths cancel the others.

Christine is a creative director whose mother was formally diagnosed with BPD when Christine was 27. The diagnosis explained the pattern she’d grown up inside and gave it a name. But naming it didn’t resolve the grief. “I can know exactly why she does what she does,” Christine told me, “and I can still feel completely undone by it at Christmas dinner.” Both/And is where Christine lives: understanding the mechanism, feeling the impact, and slowly learning that both can be true at the same time without one canceling the other. If you’re navigating this terrain with a family member, Balanced After the Borderline offers a structured path for making sense of the dynamic and beginning to protect your own psychological ground.

The Systemic Lens: How the BPD Diagnosis Became a Gendered Label

The stigma attached to borderline personality disorder isn’t accidental. It’s rooted in a clinical tradition that has historically pathologized women’s emotional intensity, dismissed their distress as manipulation, and treated attachment needs as character deficits rather than adaptations to inadequate environments. Understanding this isn’t a way of excusing harmful behavior. It’s a way of holding the full picture.

Borderline personality disorder is diagnosed in women at rates approximately three times higher than in men, according to research published in the Journal of Personality Disorders (Grant et al., 2008). Part of this disparity reflects genuine prevalence differences. A significant portion reflects diagnostic bias. The diagnostic criteria overlap heavily with behaviors that are culturally coded as feminine and therefore pathologized: emotional reactivity, fear of abandonment, relationship instability. The same behaviors in men are more likely to be attributed to antisocial personality disorder, substance use, or simply “a difficult personality,” diagnoses that carry less stigma in clinical and cultural contexts.

The very term “borderline” originated from a mid-20th century clinical concept that these patients existed on the border between neurosis and psychosis. A framing long since abandoned in the research literature but still actively shaping how clinicians, and the general public, relate to people with this diagnosis. When the language of a diagnosis carries contempt, that contempt lives in the body of every person who carries the label. It shapes what treatment they seek, whether they seek it at all, and how much they expect to be helped versus managed.

Marsha Linehan, PhD, psychologist at the University of Washington and founder of Dialectical Behavior Therapy, developed her biosocial model of BPD explicitly to challenge the character-deficit framing. Her model situates the disorder as the outcome of a biologically sensitive temperament meeting an emotionally invalidating environment, one that consistently communicated that the child’s emotional responses were wrong, excessive, or shameful. That shift in framing, from “who you are” to “what happened to you in a system that failed you,” doesn’t eliminate personal responsibility for behavior. But it opens the door to genuine treatment rather than containment.

How does this structural reality live in a person’s actual Tuesday afternoon? It lives in the clinician who responds to a woman’s BPD diagnosis with visible irritation. It lives in the insurance denials for the extended, intensive DBT treatment that actually works. It lives in the relationship where the person with BPD has internalized so much shame about the disorder that they can’t disclose it to a partner until years in, by which point the damage is already layered. The systemic failures don’t cause the push-pull dynamic. But they make healing significantly harder to access, particularly for women who don’t present as “difficult” in the ways the system was designed to recognize.

You’re not imagining how hard the clinical system makes this. The structural failures are real. And you still deserve support that actually meets you.

What Does Healing from the Push-Pull Dynamic Actually Look Like?

Healing from the push-pull dynamic, whether you’re the person with BPD or the partner or family member navigating the relationship, involves two parallel tracks that have to run simultaneously. Most people only know about one of them.

The first track is psychoeducation: understanding the mechanism clearly enough to stop taking the devaluation personally in the most corrosive ways. The idealization-devaluation cycle, abandonment terror, splitting, the intermittent reinforcement that makes the bond so hard to break. These are not abstract concepts. They’re clinical descriptions of a nervous system doing exactly what it was shaped to do. When you know the mechanism, you can start to separate “this behavior is about me” from “this behavior is about a nervous system in crisis.”

The second track is what often gets skipped: addressing what the relationship has done to your own nervous system. The hypervigilance, the eroded sense of reality, the way you’ve started monitoring yourself preemptively for whatever might trigger the next rupture. These aren’t character weaknesses. They’re logical adaptations to a genuinely unpredictable relational environment. They need direct therapeutic attention, not just understanding.

In my clinical practice, I find that Internal Family Systems (IFS) is particularly useful for partners and family members navigating BPD dynamics. The push-pull cycle tends to activate very specific internal parts in the people around the person with BPD: a part that tries to soothe and manage preemptively, a part that cycles between resentment and guilt, a part that still carries tremendous love and hope even when the rest of the system is exhausted. IFS helps you develop a working relationship with each of these parts rather than fighting them, understanding what each part is trying to do for you, and helping those parts find more sustainable strategies.

EMDR (Eye Movement Desensitization and Reprocessing) is valuable when specific relational incidents have lodged in the nervous system as unprocessed shock. Moments of sudden devaluation, incidents of rage, the specific experience of being treated as the enemy by someone who an hour earlier had been close and warm. Those memories tend to live in the body as current threat rather than as past events, contributing to hypervigilance and difficulty trusting your own perceptions. EMDR helps those experiences settle into narrative. And that shift makes a practical, daily difference.

For the person with BPD, Dialectical Behavior Therapy (DBT), developed specifically for this disorder, remains the most robustly evidence-based treatment approach available. A 2021 meta-analysis in JAMA Psychiatry (DeCou et al., 2021) found that DBT produces significant reductions in suicidal behavior, self-harm, and emotional dysregulation. DBT doesn’t remove the underlying sensitivity. It builds skills for tolerating emotional intensity without acting on it in ways that damage the relationship.

Whether or not the relationship continues, the most important thing I tell clients in early sessions is this: the patterns we’re going to look at together aren’t character flaws. They’re the residue of strategies that once made sense in the environment that shaped them. The work isn’t to shame the strategy. It’s to update the system that keeps generating it.

Where to Begin When You’re Ready to Stop Surviving It

There’s a particular kind of exhaustion that comes from loving someone with BPD. It isn’t dramatic or visible. It’s the quiet depletion of a person who has spent years trying to prevent ruptures that aren’t preventable, trying to understand a pattern that was never about anything they did, trying to hold two completely contradictory versions of the same relationship in their hands at the same time.

If you’ve been living inside the push-pull dynamic, whether as a partner, a sibling, an adult child, or the person with BPD yourself, you’ve been carrying something that was never meant to be carried alone. The proverbial house of life^™ that gets built in environments like this, where the ground of early attachment was unstable and the rules were always shifting, tends to develop specific structural patterns: rooms sealed off, load-bearing walls reinforced in the wrong places, windows that don’t open. Therapy is the work of going back through the proverbial foundation and understanding what was built there, and why, so the upper floors can stop showing the stress.

You don’t have to choose between loving someone and caring for yourself. Even though the push-pull dynamic often makes it feel exactly like that’s the choice being demanded. Individual therapy with a trauma-informed clinician can help you make sense of what you’ve experienced and start rebuilding your own sense of reality. House of Life^™ work, and the Fixing the Foundations^™ framework I use with clients, is specifically designed for people working to repair the psychological infrastructure beneath a life that looks functional but feels unsustainable.

If you’re ready to take a step, therapy with Annie or a free consultation is available to you. You don’t have to keep navigating this alone.

If what you’ve read here resonates, you don’t have to keep making sense of it alone. Balanced After the Borderline is a structured self-paced course for people healing from the impact of a borderline relationship dynamic, whether with a partner, a parent, or a sibling. It walks through the clinical frameworks in this post in detail and offers specific tools for beginning to rebuild your own psychological ground.

Related reading: Herman, J. (2015). Trauma and Recovery: The Aftermath of Violence. Basic Books. • Linehan, M. (1993). Cognitive-Behavioral Treatment of Borderline Personality Disorder. Guilford Press. • Schore, A. (2019). Right Brain Psychotherapy. W.W. Norton. • Porges, S. (2011). The Polyvagal Theory. W.W. Norton. • Kernberg, O. (1975). Borderline Conditions and Pathological Narcissism. Jason Aronson. • Winsper, C., et al. (2020). The aetiological and psychopathological validity of borderline personality disorder in youth. Psychological Medicine, 50(12), 1989-2003. • Grant, B.F., et al. (2008). Prevalence, correlates, disability, and comorbidity of DSM-IV borderline personality disorder. Journal of Clinical Psychiatry, 69(4), 533-545.

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