
NTA, this is genuinely so sad that he's trying to get you to do this again and again knowing you don't like it and especially if you have trauma. I won't tell you what to do but toh he seems like he is not respecting your boundaries at all you don't need to try it multiple times you know you don't like it and that should be the end of the conversation. I would seriously consider if this relationship is worth it to you because it seems like he doesn't respect you or ur feelings.
NTA it is your body and you dictate what you are comfortable with and what you’re not. It is horrible that he is pressuring you to do that whether or not you went through trauma. I hate to say this, but I would rethink your relationship. It is not normal for people to pressure you or coerce you to do anything.