Why would a guy start avoiding a girl he likes? I am VERY Confused!

Anonymous
OK, there is this guy...it was like instant attraction when we met. He started pursuing me (flirting, wanting me to see him, and trying to get my attention). Well, I like him too. The flirting and signaling went on for months. He did little things to see how I would react, which I reacted to let him know I like him. Then I did little things and got reaction back as well. The talking kind of stopped though and when we saw each other we would just stare into each others eyes not saying a word, as nothing needed to be said, since the looks said it all. So even most recently I did something to let him know I like him, and got a mutual response back. So now we know we like each other, and now he is avoiding me. At least it feels that way, since he use to go out of his way to at least say hi or something. Why would a guy start avoiding a girl he likes (or at least acted like he does) that he knows likes him back? I don't understand it, as now of course I feel like he doesn't like me as I would expect things to move forward...not backward or stop. I am so confused now.
Why would a guy start avoiding a girl he likes? I am VERY Confused!
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