Okay..theres this guy..We used to b bff, and now he hates me..what do I do?

okay..so me and this guy were really tight..like super tight. we werent dating but We really liked each other..he came to my house..we held hands..ext..then something happened. people startin making fun of him..like his friends and stuff and then he startin not talking to me and it broke my heart. I tried to talk to him but I pissed him off so he is going out with one of my friends(my ex friend anyways.) and Idk what to do =[