What does it mean when a guy acts like he likes you but as soon as he find out you like him he stops talking to you?

Sounds like he's a professional flirter! Seriously, though, some guys (and girls) just like to flirt. It's just fun. The problem is when someone takes casual flirting seriously and lets their heart get involved (often a natural reaction). That's when people get hurt. So, frankly, if he didn't like you in that way, he shouldn't have flirted with you. But it's the way of the world and I doubt it will stop any time soon. Try to forget about it and move on, and the next time a guy flirts with you, just try to have fun with it.