Friend Sex

So me and this guy had sex. We were nothing serious, just friends who hung out pretty much every weekend. Him and his girlfriend were in a fight, and he started to get flirty but I didn't think anything of it. I played along, then it turned into daily make out session after school but I thought it was ok because he had broke it off with the girl. We ended up having sex about a week later, and after that night we stoped speaking. What am I supposed to do. I felt like I really liked him, is it because we had sex. I probably never should have had sex with him because we were such good friends but I'm still hurt and every time I try to talk to him he says one wrong thing and I lash out on him. What can I do????