How do I get him back? ):

My best guy friend fell in love with me.He had a crush on me since september 08 and I liked him too.but I didnt want a boyfriend so we just flirted and stuff.(but we were still best friends).Then in april 09 he asked me out but I said no because I didnt want a relationship.and he was heartbroken.after that day he stopped hanging out wiht me so he could”get over me”(thats what his friend told me)and he started hanging out with another group of people and he got a girlfriend.This one girl in my class that hates me sooo much.And then we barely talked..so last week I confessed and told him I still liked him.and his girlfriend found out and stopped talking to him.and he blames me.so now hes not talking to me at all.