My crush is a shy guy. How do I know if he likes me back and does he?

We have no communication but we are always somewhat close to eachother (sitting next to me, staring, waiting for me, etc...). I added him but he didn't add me back, next thing I know his friends laughed at me (not in a mean way). He's the type to not cause any drama and is always quiet. I just wanna be friends with him first.
My crush is a shy guy. How do I know if he likes me back and does he?
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