If he sits near you again, maybe just move to one of the other corners of the classroom. I love sitting in the back corner on the side of the room with the door, but if I can't get there, any corner works fine (even at the front of the class by the wall, everyone is usually too focused to the front center of the room). I'm a guy, but considering I don't think I've ever moved more than one seat over during the course of a semester, I have no clue what he would be thinking (would any girl like some guy creeping closer to her in class?).