You've had the conversation before. Someone you love says something not even that dramatic, and suddenly you're either snapping back before you've thought it through, or you've gone quiet and pulled away without meaning to. Afterwards, you replay it and think: 'that's not who I want to be in this relationship.'
Here's the truth that changes everything: that reaction wasn't a character flaw. It was your nervous system doing exactly what it's designed to do. Any experience is assessed very quickly by our brain — and our brain, as complex a machine as it is, only has two jobs: 1 – prove me right, 2 – keep me safe.
When we react, it's usually because that unconscious assessment has either said 'DANGER' or felt a threat to our 'truth/correctness'. Once assessed to be either, our nervous system kicks in and our body takes over the decision making on behalf of our brain. It's a very old system that worked well for immediate and physical threat — it might not be serving us in a modern world, or in a modern relationship. Understanding this isn't an excuse. It's the starting point for real change.
The Problem: We Treat Reactions Like Choices
Most relationship advice assumes that in the heat of the moment, we are — or are capable of being — rational decision makers. We get advice like: communicate better. Choose your words. Stay calm.
All good advice — however, almost impossible to follow when your body has already decided you're under threat. The gap between 'knowing' how we want to show up and 'actually' showing up that way isn't a knowledge problem. It's a physiology problem. And until we understand that, we keep blaming ourselves, or each other, for something that's happening several layers beneath conscious thought.
The Science: Your Body Reacts Before Your Brain Catches Up
When something in a relationship feels threatening — a sharp tone, a perceived criticism, silence where you expected connection — your nervous system doesn't wait for your prefrontal cortex (the rational, thoughtful part of your brain, the conscious decision-making part) to kick in. It reacts first.
This is the work of your autonomic nervous system, and specifically what's often described through 'polyvagal theory', developed by Dr. Stephen Porges. In simple terms, your nervous system is constantly scanning for safety or danger — a process Porges calls 'neuroception'. It happens below awareness, faster than thought, and can feel impossible to control. We say things like 'That's just how I am' or 'She's always had an anger issue.' When it detects threat, even relational threat, it moves you into one of a few states:
Fight — sharpness, defensiveness, the urge to win the point.
Flight — the need to leave the room, change the subject, avoid.
Freeze — going blank, shutting down, saying nothing at all.
Fawn — over-apologising, appeasing, losing your own position just to restore calm.
None of these are weaknesses. They're old survival strategies, wired in long before language existed, doing their best to protect you. The problem is that they're built for physical danger, not for a hard conversation with your partner about the dishwasher. Once your body is in one of these states, logic genuinely becomes harder to access. Blood flow shifts away from the rational brain. This is why 'just communicate better' fails in the moment it's needed most — you're not choosing badly, you're just temporarily offline.
Why This Matters for Every Relationship You Have
This isn't just about romantic partnerships. It shows up with your children, your team at work, your closest friends. Anyone who's ever thought 'I know better, but I still did it anyway' has experienced their nervous system overriding their intentions and their conscious self. The good news: nervous systems can be trained. Not through willpower alone, but through practice, awareness, and — more critically — connection with others who help us feel safe enough to recalibrate.
Two Ways Forward
1. Name the state, don't fight it. The fastest way to interrupt a fight, flight, freeze or fawn response is to notice it happening. Simply naming it — 'I'm flooded right now' or 'I can feel myself shutting down' — moves a small piece of control back to your thinking brain, and gives your partner something real to work with.
2. Aim for regulation before resolution. If either of you is still in fight, flight, freeze or fawn, no technique will land. Take the physical break you need to genuinely calm your nervous system — not to ruminate — before returning to the conversation. This is the 'Acknowledge' stage of the HAPI framework in action: two regulated people, actually present.
Further Reading
– The Polyvagal Theory — Dr. Stephen Porges
– The Body Keeps the Score — Dr. Bessel van der Kolk
– Wired for Love — Dr. Stan Tatkin
Your relationships can feel easier than this. If you'd like to understand what's running underneath, that's the work of HAPI coaching. Get in touch to start the conversation.
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