What's the easiest way to cope? How do I get over the one that got away?

Long story short, I have a friend who I've known since elementary school, let's call her Sue, started dating a guy, let's call him Joe, in junior high. I became equally close to both of these people as friends, but eventually developed feelings for Joe. It's been 3 years since I've seen him. He was in a lot of trouble, to say the least, but has turned his life around. He claims he'll come visit me before I graduate, but that's almost here, and I don't think it's happening. How can I cope with the fact that this once good friend of mine has pretty much completely cut me out of his life, and how can I get over my feelings for him?

Any personal stories or advice would be helpful.