What should I do with him??

First day at school I met this guy…I had a crush on him when I first saw him, I flirted with him and I can say that he likes it. After 1month of flirting, I found out that he has a girlfriend, but he didn’t mean to keep it from me, it’s just.. I didn’t ask him. it hurts in a way because I wanted him to be my boyfriend and I think it’s not gonna happen, but I flirted with him nway and he flirted back. I’m single and I just can’t find the right man for me. 1 day before the end of school, we make love..I know this is sooo wrong but I couldn’t help myself doing that..I thought he would able to like me doing that. He never text me after what happened to us, I always check his account in myspace and I read his shout out saying…”I love my girlfriend” it’s soo painfull inside! My friends are mad at me because of what I did. School is coming and I’m really shy seeing him again, what should I do with him??