My boyfriend is abusive, don't know what to do

Pegah🎈💎 • In a hell relationship
Okay don't start with obvious comments of break up with him. I know I should, it's just that, he was my best friend during the last 3 years, in a time that i was dating a parade of jerks who all dumped me or cheated on me or... And then he said he loved me but i said I don't love him back and after 4 bad months I realized i did too so we dated. The first week was great, amazing but then he turned to this whining abusive always complaining freak, he hit me twice but said I deserved it and it wasn't that hard ( it wasn't but that's not the point right?) and he always makes bad fights when I don't want to do some particular sexual thing. He degrades me when talking to me and is always bullying. His friends say he does it because i said at first that I don't love him back and he doesn't want me to think i am too important for him, but it is getting exhausting. All we do is fight and i am always scared. But he is the firstperson who said he loved me after loooots of jerks. I don't know what to do