How can you apoligize to an ex-boyfriend?

I was so mean! Ok this guy liked me kinda and i didnt lik him @ all really. It was all a joke my friend set up. But I think he found out cause the day I told this blabber mouth(idk why i told her) he broke up w/ me on aim. Now he blockes me on aim and when i text him he doestn responden and when i call him he ingores it. What should I do????HELP! and we are supposed 2 go bowling with my friend and her boyfriend!! HELP!!!