We have been friends for years now and he has suddenly stopped talking to me. He won't even acknowledge me in the hallway. He has never had a girlfriend (we both think young dating is over rated) and nothing bad has happened in his life. Oh and please when you answer this, I don't want any junk that won't help me like, 'He probably hates your guts now.'. Thanks. Oh and if anyone has any ways that I can communicate with him without annoying him, that would be great.

Do you have any other way of contacing him? Call him and ask him what the problem is.

That's what happened to me as well. Try finding a right time and ask him if something is the matter.
Is he hanging out with someone else, or maybe there's something important he can't tell you.
It's hard to tell with boys.