Does the boy in my class like me or is it just me?

A boy from my senior year in high school, whose name I don't even know, sent me a request on Instagram a few months ago. I realized a day later that he was from our class, but I didn't accept his request because I don't know him. When I didn't accept, he withdrew it and checked his request a day later. Anyway, after that day, he started looking at me constantly. I don't know if he was looking at me before. After the request, I started noticing. He turned around and looked at me weirdly. We never talked, but what do you think of this?

Does the boy in my class like me or is it just me?
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