What does it mean when a guy puts his hands over his genitals?

Anonymous

I was at a dance yesterday. The guy I like came up to me and another group of boys asking what we were talking about with his hands over his genitals when he came up to me. He only does that when I'm around. I've never seen him do that to another girl.

What does it mean when a guy puts his hands over his genitals?
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