Hey OP,
I've been meaning to actually reply to this thread for a while now, but have delayed it till this point in time.
Anyways, I have no idea what the specific details of your situation are. From what you posted, I can only assume that you were very close to this person and that, because of some event unbeknownst to me, you two grew apart.
I just wanted to tell you that this is normal. In fact, if the other person did nothing to attempt to reconnect with you, then this outcome would be better. I'm sorry if that's hard to hear, but I guess I can sympathize with what you're feeling right now.
A while ago, I "lost" contact with a very close friend of mine. She hasn't talked to me for a while now, but that's okay. Truth is, OP, you lose people. It'll hurt and you'll be sad.
The thing is though, you can't let this get you down. I'm certain you'll find another friend to talk to. Humans are social beings, you're bound to find someone else in this world that will be interested in stuff that you'll like. In fact, I'm certain that they'll even make the attempt and get to know who you are, OP, and sympathize with whatever pain you experience.
I know you have the strength to get over this.
I believe in you.