Why does he look at me but has trouble talking to me?

This guy always stares at me when he thinks I don't notice. Anytime I try talking to him he seems shy or nervous but it really isn't that hard. He won't talk unless I initiate it. Why will he only look and not initiate conversation? It's driving me nuts because it's been going on for almost a year.

Why does he look at me but has trouble talking to me?
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