Why does he act like this around me?

I was talking to this guy today and he was sitting with his legs spread. Then he crossed them and squeezed them together really tightly then fidgeted around in his chair and looked like he couldn't squeeze them together tight enough.

He sometimes looks uncomfortable around me and when we are talking I notice that he sometimes quickly looks down at his pants and then back up.

Other times he sits down but moves his seat so that he's sitting away from my view and crosses his legs and balances his ankle on his right knee

Sometimes he goes bright red when I walk into the room and he excuses himself to the bathroom and then comes back and is normal again. Why would someone do this? Does fidgeting mean I make him uncomfortable?

Why does he act like this?
Why does he act like this around me?
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