He's shy around me... but confident with everyone else?

This guy I kinda talk to completely shuts down around me but he's not that way with his friends or other girls. He's always staring at me and watching almost my every move... especially out at parties. But he won't come speak to me, instead I have to speak to him and he'll barely talk.

When other girls approach him at parties he seems chatty. We also have a class together and I always catch him staring or he'll text me to get my attention... but never can hold a face to face conversation.

What's all of this about? Why is he so shy and quiet?
He's shy around me... but confident with everyone else?
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