Question: what does it mean when a boy looks at you all the time?
Answer: If you are a boy, a guy looking at you means he likes you, maybe he has some crazy thought about you and your body, that you are of the same kind as he is. If you are a girl, just say “Hi”and walk away, if he wants to talk to you just because you are so attractive that he can't resist to make acquaintance with you.