Why are guys nervous around some girls?

Anonymous
Asking this because there is this guy who I kinda like me him and his mom went to McDonald’s to order some food and while we were waiting in line his mom asked him “haha why do you look nervous?” And I just kinda looked at him letting out a laugh but he didn’t say anything and just kept walking with a straight face. Even if he wasn’t nervous because of me ( I shouldn’t assume anything I mean it could mean anything and his mom was prob teasing him) why do some guys get nervous around some girls?
Why are guys nervous around some girls?
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