Why would my guy-friend suddenly decide to be mean to me?

Anonymous
A very close guy friend seems to have all of a sudden changed his behavior with me. He won't talk to me as much as he did, he's really cold and will not talk to me not as near enough as we used to do, and this all seems to have come about since I started dating someone. Although, I told him I liked him a while ago and he said he didn't see me in "that way" and just wanted to be friends. I don't understand why he's suddenly switched his attitude? Or what I could have done to p*ss him off.
Why would my guy-friend suddenly decide to be mean to me?
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