Guys can show their emotions towards you in many different ways. If he is shy, he might just clam up and seem to ignore you! Sounds weird, but he might just be scared to talk to you. You might catch him looking at you often, or smiling at you sometimes. He might also try to impress you by doing stupid little quirky things, like trying to race you or tell you lame jokes. He might also pretend that he doesn't like you! It can be complicated sometimes! The best way to find out is to just hang out with him for a while. If you're interested in him, just come out and tell him that you like him! He will usually appreciate you being up front and honest with him. You can always ask him directly too.