How do guys act when they like you?

Well it depends on the guy!

If he talks to you and brings you into conversations or obviously flirts with you, then you have a 89.999 chance he likes you.

If the guy talks to you but never seems flirty or interested or you feel he doesn't like you enough, he probably isn't interested and just in it for the flirting.

But no matter what, keep trying your best and no matter if he doesn't like you or not, remember you can do better or he just isn't good enough for you. Good luck!