Friendship trouble

I had a really great friend once. We use to hang out a lot, but I have been busy and now I think he hates me because of it. I have tried to apologize, but he won't listen. What should I do?

Make him UNDERSTAND that you're sorry.
If I were your friend, I wouldn't want to listen at you either. If I were your friend, I'd surely think: "WTF? Just because she comes over ONCE and thinks, if she apologizes I'll forgive her, like hell I will!"
It takes a lot to make people understand you're sorry. Lately, I had fights with two good friends, because they were so focused on themselves and I felt so left out. i didn't really want to kick up a row, but my anger felt so enormous so I totally ignored them. They came on over once, to ask what they had done wrong, but (and I'm sure your friend felt the same way) at one side, I was so furious!
I was like: "Yeah, they've hurt me so much and now they come on over and act like: ah let's be friends again... I'll forgive them?? yeah, SURE!"
and on the other side, this will be a little like a metaphor: my heart and my whole body was trembling. I was like: "No no no! Please go away!" I was so afraid. I was afraid to tell them what they did wrong, I was afraid to show I'm weak and I also need their love and affection.
I tried to tell myself: "Who cares? I'm better off without them"
But in the end, I was wrong.
One of my two friends wrote me a really touching letter and said that she was very sorry and would like to talk to me. We hit the playground where we always like to meet, went to the swings and the first thing was that we were yelling at each other.
But after everything was said, she meant that she didn't want to lose me; after all, we're childhood friends.
Do whatever you think is necessary, but make sure you hit a sore spot. Make sure you make good use of your speech. Open up your heart, and most of all, you must not justify yourself and the things you did wrong! If you do justify, your friend might think you're too full about yourself to care about his problems.

Good luck!