Please help!

[deltajas]

Hey
I was dating someone for about a month before school ended, and long distance all summer. Well about a week and a half ago I went somewhere with an ex, but nothing happened. Anyways I told my bf about it and he broke up with me and had been really rude ever since. I tried to call him and email him to talk, but he says he does not want to talk about it, and not to call him for a while, I really wish he would. Anyway I will probably see him within the next couple of weeks because my sorority and his fratenrnity do a lot of things together, especially for rush. I eamiled him yesterday again and asked if we could talk about it and be friends. He has not responded yet.
So, how do I handle it when I see him? And why is he being like this if he knows he will see me? Has anything like this happened to anyone before? If so please give me some ideas. I would really like to talk about it with him but he is being soooo stubborn