What do guys think when they catch a girl staring at them?

there's this guy in my public speaking class that's perfect in terms of looks, like a 9/10. he's not annoying or flamboyant like goodlooking guys can be but calm and confident. Unfortunately I am extremely attracted to him. I cannot keep my eyes off him because he's too delicious. I am annoyed with myself because usually I handle things better with guys and don't act weird or stupid. I guess u could say I get attention but i don't think I'm that cute and Ik he's way out of my league. In class I kept taking glances at him. But during my speech he caught me looking and flicked his eyebrows and smiled a little. I was so embarrassed. Do u think he knows?
What do guys think when they catch a girl staring at them?
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