Why does he shut me out?

How do you deal with a guy that gets angry with you (for some reason), doesn't confront you about it but instead all of a sudden turns around to you and tells you he don't want to stay in contact with you anymore? A couple of days before everything was fine. What is that behavior all about? Wouldn't you normally give an explanation?

It seems like every time he feels hurt he absolutely shuts down and eliminate him from his life entirely. Now he refuses to talk to me or respond if I email or text him. I don't think that's very nice of him. What should I do?
Why does he shut me out?
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