When One Partner’s Nervous System Is Running the Relationship
When the Temperature Keeps Changing
There’s a dynamic I see regularly in couples work that neither person has quite named yet when they come in. One partner is more easily activated. Conflict escalates faster on their end, or they go quiet in ways the other person can’t read, or they need more reassurance than the relationship can seem to sustainably provide. The other partner is managing around this without fully realizing that’s what they’re doing.
Neither person is the villain in this dynamic. But it does mean that one person’s nervous system is largely setting the emotional temperature of the relationship, and both people are living inside the climate that creates.
This isn’t a character issue. It’s almost always a history issue. And it’s one of the more common things I work with in couples therapy in Oakland.
What’s Actually Happening
When someone grows up in an environment where emotional safety was inconsistent, where a parent’s mood was unpredictable, where love came with conditions, or where conflict reliably meant something bad was coming, their nervous system builds a model based on that experience. That model shapes how they read situations in the present.
A partner going quiet after a hard conversation gets filed under withdrawal, which might mean abandonment. A partner’s frustration gets read as the prelude to something much worse than frustration. A moment of emotional distance triggers a level of alarm that doesn’t match what’s actually happening, because the nervous system is responding to something older than this relationship.
The Polyvagal Institute’s work on nervous system states helps explain why this happens at a physiological level. When the nervous system perceives threat, it responds before the thinking brain has a chance to weigh in. The response is fast, automatic, and based on pattern recognition from the past.
For the partner on the receiving end of this, it can feel confusing and exhausting. They’re trying to be present, trying to do the right things, and still finding that their partner cycles through activation in ways that don’t seem connected to what’s actually happening between them. Over time, that partner often starts walking on eggshells without quite naming it as such.
How It Affects Both People
The partner whose nervous system is more reactive tends to carry a lot of shame about it. They know, at some level, that their reactions are bigger than the situation warrants. They’ve probably been told they’re too sensitive, too much, too reactive. They’re often working hard to manage themselves and still feel like they keep getting it wrong.
The other partner is doing their own adaptation. They’ve learned which topics to avoid, how to soften their tone, when to give space and when to move toward. They’re not always conscious of how much energy goes into that navigation, but it takes a toll. Relationships that require one person to constantly manage the other’s emotional state tend to produce a particular kind of quiet resentment, not because anyone is doing something wrong, but because the distribution is genuinely uneven.
What often gets missed in couples therapy is that both partners need support here, not just the one whose nervous system is more activated. The managing partner has usually developed their own patterns in response, and those patterns deserve attention too.
Why Couples Therapy Alone Sometimes Isn’t Enough
Standard couples therapy helps couples understand each other better, communicate more effectively, and repair after conflict. For many couples, that’s exactly what’s needed.
For couples where one or both partners carry significant childhood trauma, there’s often a ceiling. You can understand the pattern, name it in real time, even have genuine compassion for where it comes from, and still find the nervous system doing what it’s always done the moment things get tense. Understanding doesn’t update the physiological response. That requires a different kind of work.
Research on trauma-informed couples therapy suggests that addressing individual trauma histories alongside relationship dynamics produces more durable change than focusing on communication skills alone. [external link: NCBI — ncbi.nlm.nih.gov on trauma and couples therapy outcomes]
This is part of why I often encourage individual trauma work to run alongside couples sessions, rather than treating them as separate tracks. When the partner with more activation is doing their own EMDR work, building nervous system capacity, and updating some of those old threat responses, the whole dynamic in the relationship tends to shift.
Where Ketamine-Assisted Couples Therapy Fits
For couples who’ve already done meaningful foundational work together and keep hitting a specific kind of stuck, ketamine-assisted couples therapy in Oakland is something I offer as an optional next step for the right fit.
The ketamine, at a low dose during the session, lowers the nervous system’s defensive threshold enough that both partners can reach each other in ways that usually get blocked. The partner who typically activates quickly has a little more room before the system fires. The managing partner has a little more access to what they actually feel rather than what they’re performing. That shift in conditions, even for a single session, can open territory that months of conversation didn’t reach.
This approach works specifically for couples who have enough stability and basic safety in the room to go deeper. It’s not a starting point. But for couples who are genuinely committed and genuinely stuck, it’s worth knowing this option exists.
What Changes When the Work Actually Lands
When the partner carrying more activation starts doing their own trauma work, something shifts in the relationship that’s hard to fully describe from the outside. They begin to have more choice in how they respond. The activation still comes, but there’s a little more space between the stimulus and the reaction. They’re less at the mercy of their own nervous system.
For the managing partner, this tends to feel like relief they didn’t know they were waiting for. They can be more direct. They can have harder conversations without catastrophizing what it will trigger. They can let themselves be in a relationship rather than managing one.
This is what the research on childhood trauma and adult relationships points toward, and what I see consistently in my practice. The patterns that feel like personality are often nervous system adaptations, and nervous system adaptations can change with the right kind of support.
If This Is Your Relationship
If you recognize your relationship in any of this, a consultation is a good place to start figuring out what kind of support makes the most sense. Sometimes that’s individual EMDR work for the partner who’s more activated. Sometimes it’s couples therapy that accounts for both people’s histories. Sometimes it’s a combination, and occasionally, for the right couples, ketamine-assisted couples therapy in Oakland becomes part of the picture.
I work with couples and individuals in Oakland and across California navigating exactly this kind of dynamic. The work is specific, it takes time, and it’s very possible to shift.
About the Author
Mary Fleisch, LCSW, is a trauma therapist in Oakland specializing in EMDR Intensives, Ketamine-Assisted Therapy, and couples therapy for adults navigating childhood trauma and complex grief. She helps individuals and couples build healthy boundaries, calm their nervous systems, and reconnect with a sense of safety and self-trust.
