Why is it that some guys are shy around pretty girls?

Anonymous
I've been told I'm pretty by many people. well there's this guy in my class that I like and I know for a fact that he likes me because he always stares at me, but when class is about to be over he stays distant and only looks when I'm not looking. I just want to know why guys are like this.
Updates
+1 y
i don't know he seems outgoing in class. but then again I look over sometimes and he doesn't even talk.
Why is it that some guys are shy around pretty girls?
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