Something’s making me sick..

I’m bisexual, and I’ve only been with girls before my current boyfriend. He’s a lot more passionate at kissing than my exes, so maybe the saliva or something contributes to it, but my issue is, I’ll feel sorta sick/nauseous after we kiss sometimes. I love him with all my being, so I don’t think it’s resentment to him, but it feels like because it’s a guy I’m like ..ew 😂😂 I’m attracted to him though?? I’ve got a past with a lil bit of trauma in an instance where I almost got kidnapped and it gave me some issues that still hang with me, especially with men. Is that why? Does this happen to anyone else? Help??? Please?????? 😂 thanks for any advice you have tho.