Guys, why this talkative and confident guy is quiet around me? He hang out with girls a lot and he's normal around them and quiet around me. Why?

Anonymous
I meet this guy few months before college and we talked a bit. He seemed like i catch his eye of all people there. He looked at each other and he was acting like he wants my attention.
Then we didn't see long time till college.
We are in different colleges in same building but we see each other 2-3 times a week. He always notice me and look in me but he's quiet when im around. Even when he was with his friend he talked and then sit next to me and he didn't say a word. I notice he listen when i talked and he lightly touch me. After he moved to his friend and i notice he looks.
He's always like that for 4 months now. Also when he saw me with his good friend from my college next day i meet him in my part of college. Also when i was with that friend i had bag infront of me and he walked and like lurking behind beg. Friend and I started to smile and he did too. He sometimes acts like that when he can't see me or when i look in his way but can't see him.
He have that girl friend and he always hangs with her. She broke up with her boyfriend 2 months ago. He didn't changed the was my crush acts like me.. but he's really cute so im jealous!!!
When my friend asked for my crush her.. does he has girlfriend she said that he don't have and that she don't know what else to say and asked who ask for my crush. I think that they are just good friends.

Why this guy acts like that. I never meet guy like that? Help?
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Guys, why this talkative and confident guy is quiet around me? He hang out with girls a lot and he's normal around them and quiet around me. Why?
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