First he will talk with you clearly and directly about how he likes you. If he does not say "I like you" then he doesn't. If he does anything else to show you he likes you but doesn't say he likes you, he doesn't like you. If he tells other people he likes you but doesn't tell you he likes you he doesn't really like you he just likes the idea of letting you think he likes you. If you don't really know him then he doesn't really know you either so he has no way to like you just like you have no real way to really like him either.
OK, first that is not right. He might be shy he doesn't have to say he likes you, you should just talk to him about anything and if he doesn't don't feel embarrassed you might even just ask him.