@lollypop35,
Well, people aren't always around. That's life. Sorry if you don't want to hear this, but it's his decision to study there and you've got to respect that.
Why not write him a letter? You know, with paper and a stamp and all of that? Something heartfelt, maybe funny. If you're not sure of what to write, send a card and write a little about how school is, that sort of thing. I bet he'd be thrilled to get it - handwritten letters are really rare these days.
And hang in there. He won't be gone forever.