What to do with a shy guy?

I'm really outgoing and I hope I'm not sounding cocky or anything but people do know who I am and say that I'm popular There is this guy, and no one knows who he is, which makes me want him more. When he is with other guys and me or just his friends he's really funny and everything, which caused the initial interest. He visits me just to say hi, and he does say hi every time but that's really it. But now that he knows I'm interested in him, he has become so much shyer. His friends tell me he likes me, but I don't know. he stares at me all the time, but why is it that every time I ask him a quesiton he freezes up and stops making sense? also, I gave him my number to call me this weekend but he hasnt. should I stop trying?
What to do with a shy guy?
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