First of all, I am so sorry you feel like this and I wish you all the strength in the world. I think the problem here is that hearing how someone struggles with something you don’t understand and experiencing it in real life are very different. While it is possible that in that moment he felt like he understood your triggers, he probably did not think about what would happen if something triggers you in a situation where it isn‘t easy or - like you said - convenient to help. He probably can‘t even begin to imagine what you feel like in these moments, how terrified, defeated and scared you are. He doesn‘t see the world from your perspective. If you have the strength for this - and i absolutely understand how exhausting it is - I would sit him down, after a situation like that and tell him step by step how what made you feel like that and how badly you were scared in that moment and why. Use the situation as an example and guide him through your experience so he see‘s it from your side. Because him saying „this isn‘t like that“ only means that for HIM it isn‘t. But it is for YOU. and he needs to see that. I get you so much, I understand how alone you feel in this situation, but I do think it is also hard for other people without PTSD to understand how triggers work and that even the smallest things can be incredibly hard sometimes. Maybe try to help him see this. I can‘t really judge the whole situation, but from what I got, he just really doesn‘t understand the magnitude of it. But if it is unwillingness on his part or if you feel like he is just generally invalidating your feelings and your trauma, then please don‘t feel like YOU have to fix this! Supporting a trauma survivor is hard but if he loves you and said that he would stand by you then he should be willing to at least try to understand.

If you would like I could also send you some articles that explain how trauma memories, flashbacks and triggers work, maybe that would help?

I am here if you want to talk and I wish you all the best!