Why would a guy be nervous about sex?

Anonymous
My crush is a little bit of a show off. He likes to be goofy, asshole, show off and cocky. He's really confident around me until the room starts to get. When we are alone, we all know what's about to go down. He gets nervous but so do I. I sit close to him and he gives that nervous smile. He's so nervous he can't stop smiling, he can't sit still. I move away or go somewhere else but he wants to continue it.
He brags to all his friends about me and how he's going to score. We haven't done anything yet because we're both nervous. I'm nervous because im a virgin. He has had long term plenty of long term girlfriends and he has a child with his ex girlfriend.

What is he so nervous about?
Why would a guy be nervous about sex?
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