What is on his mind when he's staring at me?

so there's this guy at my school. he's my crush's friend. And he's always staring at me with a serious face like I did something to him whenever he sees me. At first it was just a from time to time thing but now it's gotten worse, I really need to now what's going on in his mind because he's really freaking me out. I really need help.

What is on his mind when he's staring at me?
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