Why is it that this guy who you know likes you is always dissapearing from your sight for long periods of time Is he doing this so that you miss him?

If he knows that you like him and he doesn't like you back, it's probably because he doesn't want you to like him. But, if he doesn't know you like him, then it's probably just a plain coincidence. If you two both like each other, then probably not. I honestly think it's plain coincidence that that keeps happening. I don't think guys purposelly stay away from someone because of something like not liking a girl. I don't think they even think about that.