My (18f) boyfriend (19m) might've assaulted me, what do I do now?

Last weekend me and my boyfriend got into a couple bad fights that were started by me. We discussed this and had mostly moved on from them by the Saturday night. Then the Sunday morning, after I had spent some of the night crying, he tries to have sex. This isn't abnormal but I was tired and exhausted from crying so I said 'you better not be horny I don't wanna have sex rn.' He laughs it off and I turn around but then I feel him trying to start again. I give in to this and we fuck for a little bit until I push him off me and say 'no I'm really not feeling this'. This time I really try to roll over and sleep but he insists on finishing on me in a position that I cant ignore what he's doing. He justifies this by saying I wasn't going to get back to sleep anyway.

This upset me for most of this week and I couldn't stop thinking about it. There have also been a couple incidents before this where I have clearly not been interested in the sex but he will pretend not to notice and insist on finishing. I know he's pretending as we will discuss afterwards and he says he noticed but wanted to keep going. I told a friend who insisted I break up with him and that it was sexual assault but I'm not sure about breaking up or if it can even be called that. I don't know if this was just a miscommunication between us

Final note that upset me is that I brought up how upset I was about last Sunday to him earlier and he insisted he barely remembered anything about last Sunday or the sex we had. As the conversation continued he almost tried to say we didn't have sex at all. I hung up on him at that point and haven't spoken since