Cw: sexual language, penetrative sex, oral sex, anal sex

For context, I'm M25 gray asexual and my bf is M24 gay. My sexuality for other people is very limited and I have little desire to have sex, however my bf has 100% homosexuality.

When in group chats or on other social media websites, my bf would make comments to other men like "I wanna fuck you", "You should sniff my pits", "You should suck me off", etc.

I get if he says something like "You're so hot" or "You're handsome" or whatever. But I'm not sure how to feel about full-blown sexual comments, especially as an asexual. I know his comments are supposed to be banter or unserious fantasies, but I understand that sex is supposed to be intimate.

I talked to him about our compatibility with regards to sex a few times, and he said that sex means nothing to him – its just a drive he feels without any romantic attraction. And that we don't have to do sex if we don't want to (even tho he would love that I try).

Why do I feel jealous about something I don't even desire? Why do I feel jealous even when I know that he says these comments without meaning it? Do I even have a place to confront him about it when I am often sex repulsive?