Why does he constantly glance at me if he is not interested in me?

My crush found out 3 years ago that I had a crush on him through mutual friends. Now after seeing each other for the first time in years he keeps staring and glancing at me from a distance.

I have also noticed his friend keeping an eye on me and occasionally mirroring my gestures/movements (for example when I yawn, check the time etc.). So he probably told him about me.

Why does he do that? To inflate his ego or because he is annoyed? What do you think? I'm know that I'm not his type

Why does he constantly glance at me if he is not interested in me?
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