It might mean that, why don't you ask him? Do you go to school with him or do you hang out? It's been a long time since I've had to deal with crushes but I don't see any reason to be rude to you like other people, if you like him then try hanging out with him in a group, invite a lot of people and go to a fair or the movies and ask him to join you guys.
It doesn't mean he likes you. He just happen to like the picture that appears as your profile picture. He may also like your wall posts and the comments you make, but this don't mean he likes you if he has never met you in-person.