It's difficult. Insanely difficult. I'm not going to lie: this will not be an easy battle, especially if you're so attached to him. It doesn't sound like he's attached to you at all... perhaps he was initially interested in the sex, and the sex, alone? I don't know. I'm not this person. Nor am I you, nor do I know of the entire situation, but it certainly sounds like he doesn't care about you nearly as much as you care about him, which is a terrible situation to be in.

What I can say, though, is that time will fix things. It doesn't sound like he's willing to contact you, which is going to hurt quite a bit, but it's still better than leading you on. Paranoia, fear, loneliness, over-attachment, all of that... it is a terrible, terrible thing to feel, and I wouldn't wish it on anybody, and it's just not fair that it happens to people, but it does. You cope with it, though. You deal with it. You push through it, because there's not much more of a choice, and then, eventually, you forget about it, regardless of how much you want the opposite, at the moment. At the very least, he isn't leading you on. Not anymore, at least...