Why does my "crush" adjust his pants around me in a weird way?

Because of his job, my "crush" wears windbreaker pants or whatever they're called. So, this is the deal. Whenever I talk to my "crush" he adjusts his pants in a weird way. He puts his hands in his pockets and kinda lift his pants to adjust them. One day as I was sitting he walked into the room and stood beside me. He kinda touched himself in that area quickly and adjusted his short pants. He does try to play it off.

What in the world? Why does he do that? Is he sneaking an itch or is he kinda "excited"?

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