Is this guy interested in me and what should I do?

He sits across from me in class and today I caught him looking at me at least 10 different times in the span of one lecture, but every time I turn back to him he looks away. I usually stare back at people who stare at me until they feel awkward but he didn't break eye contact. He only looked away when I smiled at him, I don't know if that's progress or I just made it weird. I've caught him looking at me a few other times but not like this. I like him but don't know how to approach, I don't know him that well even though we have mutual friends & have hung out in a group setting before. I feel like I'm just imagining it lol, any advice is welcome.

Is this guy interested in me and what should I do?
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