Why does he keep staring at me (10 points)?

Well school just starting on Wednesday, but for the past three days this really cute guy in my reading and math cl keeps one staring at me. When I first walk into school in the morning I keep seeing him sitting by he's friends just looking at me, and I see him do it in the lunch line and sometimes in cl to. I think only one time has he stared at me has he smiled, I also smiled at him once to when he stared at me. But every other time he looks at me, he has this real intense, serous look on his face and even when he knows I see him he keeps staring at me. The only time we talked is when he asked me a question about were the pencil sharpener was. But now I'm staring at him a lot to, but he's hasn't really noticed. Does he like me, and what should I do?