Do you know any of his friends, were you could casually find out if he has called or talked to them while he's been away?
It's hard to say on his behavior, it is a little weird he wouldn't 'friend' you on facebook, unless he doesn't go on barely, and hasn't realized you requested him. He could be thinking he is keeping his options open by not deleting his dating page, but then that also is not fair to you. It sounds,from your post, that you want and feel this is a commited relationship, and by how you say he is acting he may be still keeping his options open. I'd see if he's talked to anyone else while he's out of town, if so, and he hasn't bothered calling you;then it is probally time for you to move on, so you don't end up getting more hurt in the end.