I had the same thing, I never knew him but he used to always look at me or in direction at breaks and Lunch.
But me and him are actually really good friends now, I was confused at first but it just ended up being a really good friendship.... That was after we met in the most awkward way possible if I were you I'd p,ah it out a little bit and see if he carries on looking at you, if it gets uncomfortable or weird for you just simply ask him why he looks at you all the time, from then on it's really easy to see if he likes you or not, the blushing, stuttering, fiddling with his clothes or fingers. But it's up to you xxxx