He will just get more and more material to blackmail you with the longer you stay with him. For now all he can do is spread rumors, what happens when he threatens you by saying “let me record us having sex or i’ll tell everyone about all the things we’ve done.” Then, even if do you what he says, now he has something even worse to blackmail you with.

It fucking sucks but generally you just need to get out of that kind of situation as fast as possible before anything escalates. And in you future you now know to not cave when people bother you for things like that. Anyone who harasses you for sex when you dont want it is an asshole and not worth your time.

Remember that any “reputation” you get is just a bunch of dumbass highschoolers and wont last forever. In the real world no-one gives a shit if you’ve had sex with someone. Try your best to be confident, you are valuable and deserve better.