Guys why would you go quiet around a girl?

Anonymous
there is this guy that I kinda like.. and I'm friends with his group of friends. I always see him talking and laughing with them but when I join them he goes quiet and just stares at me.. he's so shy he doesn't even say anything to me even though we had lots of interesting convos on fb before, what could this mean? :\

BTW the girl he likes is in the same group..

so should I just ignore him and forget about him?
Guys why would you go quiet around a girl?
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