Q: Dear Max, How do I know when a boy likes me?
A: I am going to tell you something about us guys– a lot of us are very fond of dancing around the point when it comes to girls. 
Look for small hints or behaviors directed solely towards you. Another thing you can do is just ask. It can’t hurt to be direct, and maybe that is what the guy wants. Otherwise talk to his friends– that is another way to get an easy answer.
It is best to ask directly. If you are shy you can work around it using 2kuut.com. The idea is that either you both agree or nothing happens.