Why will a guy become close to you and then suddenly act distant?

Anonymous
This fall, I became really close to one of my guy friends who've I have known for over a year. We've always been good friends, but we became particularly close at the beginning of the school year and stayed that way for a while. I developed a bit of a crush on him, but he had a lot of stuff going on in his life, and because I valued his friendship and didn't want to mess things up, I kept it to myself. Well, in the past few months, he has started acting distant and it's really upsetting to me. He's really close to this other girl now, but apparently they have a purely platonic relationship (this other girl has a boyfriend) but I still feel completely left behind. And now he's giving me the hot and cold treatment - sometimes when he sees me he smiles and says hi, other times he blatantly ignores me. I really don't understand what the deal is though - I never told him or anyone else that I liked him, and even when we were close I always took precautions to give him his space when he needed it and never smother him. He used to be someone I was completely comfortable around and now it feels like I'm walking on eggshells when I'm around him. What the heck? :(
Why will a guy become close to you and then suddenly act distant?
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