He looks at me! If a guy looks at you a lot, it means that he in some way likes you? And if he always quickly looks away?

So this guy in my history class, looks at me a lot, which is kinda weird, anyways whenever I look back at him he quickly turns his head or something. What does that mean? I was wondering if I have something on my face, but I certainly don't all the time. My friend says he likes, but I really can't imagine he does
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+1 y
I should mention, that I know him a bit, we talk sometimes, so there's really no reason to look away
He looks at me! If a guy looks at you a lot, it means that he in some way likes you? And if he always quickly looks away?
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