He runs a hand along your arm, gentle, the way he always does, and your whole body locks. Or the room gets far away, his voice arriving from another floor, and you come back a few seconds later without fully knowing where you went.
This is not him. You've told yourself that already, and it's true, and it hasn't changed anything, because the part of you reacting isn't listening to that sentence. It is running a much older instruction: a body that learned, somewhere, that a hand arriving could mean danger, and it built a reflex faster than thought to protect you from it. That reflex doesn't check the calendar. It doesn't know this is a man who has never hurt you. It just fires.
Why insight alone does not touch this
You can probably explain exactly why this happens. You've named the pattern, understood the mechanism from every angle available to you. You still flinch. Understanding a reflex and retraining a reflex are two entirely different jobs, and the second one only happens through the body, not around it.
What actually moves a protective reflex
The work here is not to override the flinch, and it is not to ask him to stop reaching either. It is to give your body so many small, predictable, low-stakes experiences of touch that its prediction slowly updates: this hand, at this speed, in this size, does not mean what the old one meant. Every rep counts. None of them can be rushed to look like progress.
Start entirely alone. Touch Base®: thumb to forefinger, moved slow, like melted chocolate, two minutes, saying to yourself, I am safe right now. This is not for him yet. It is you teaching your own nervous system, on your own schedule, what safe contact feels like when nothing is being asked of you in return. When you're ready to bring him into it, one prompt with three allowed responses (the Dyad: "Thank you," "Clarify that," "Summarise that") lets you tell him what you need without either of you having to guess or defend.
A reflex that took a long time to build does not need to be forgiven. It needs new evidence, delivered slowly enough for your body to actually believe it.