Well all guys behave differently, but here are a few tell-tale signs a guy likes you:
~ He smiles at you a lot.
~He might act kind of shy and awkward around you.
~He wants to be around you all the time.
~He talks to you and wants to know things about you.
~He stares a lot, especially if he thinks you're not looking.
~He's always asking other people about you.
~He tells you he likes you.