Why does he blush so much?

This guy in my Science class sits right next to me and since the tables we have are for 2 people, we are usually lab partners and talk to each other sometimes. Whenever I look at him, I notice he's blushing a lot, even if he's writing down stuff. I don't know if he likes someone in there or what, but it's something I notice whenever I see him.

Why does he blush so much?
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