Do guys act nervous around girl they are interested in?

There's this guy (he's a year older than i, and my family is close with his) he always seems a bit nervous around me, but is comfortable with my sisters. Is there a reason this could potentially be? I am a bit interested in him and he has asked for my number previously which I gave

Obviously i didn't provide too mch detail, but I'm happy with any general input

Thank you!

Do guys act nervous around girl they are interested in?
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