You know it does sound like he is being unreasonable but then i don't know the entire circumstances. Sometimes friends just need some time apart and he sounds as down as you do in those message sto eachother, so maybe he is dealing with his own head and doesn't see a way to fix whatever got broken between you two. But it doesn't mean things are over for good even if they feel that way. I have been to points with my best friend that i never thought could be fixed and neither did he but eventually you find a way back into eachothers lives. It might be that your never as close as you once were and that is hard to accept but people change and grow apart, but with friendships that have lasted that long they tend to keep your tied together even when you barely speak anymore. So don't feel abandoned by him, give him some time and if he offers you a way back in then i suggest taking it and try keeping yourself open to him. Hopefully he will sort through the things in his head and you two will be able to resolve what has gone on.

Hope it all works out.

Mark