What makes a guy nervous around a girl?

Anonymous
There is a guy I know is outgoing loud and is not shy around people even with girls. But I am shy but once you get to know you I will open up more and talk. he is confident around the girls I see him with like he can joke and tease with them and even sit with them. With me he will not talk or flirt unless we are alone I have approached him with other people around to see if he will open up more but he will not say much. He will stare at me from across the room and gets nervous more quite shy and sweet to me he can not even sit next to me. Sometimes he will just blush smile and give me a nod. A lot times I do catch him has confidence he will just stare deep into my eyes will not say a word I do stare back we have flirted by winking and brushing up against each other. Why would this confident outgoing guy act nervous around a shy girl. I know he likes me and it seems to me he is really a shy guy who tries to funny cocky outgoing guy in front of crowds especially around his friends.
What makes a guy nervous around a girl?
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