So I Need Some Advice??

So I really like this guy, and I think he likes me back well this whole incident happened at school and I was on my friend's side cause he insulted her so he had to leave early. Well, the next day was the last day of school and he was there and he like kept ignoring me the whole day. So anyways I tried talking to him on Facebook and stuff but he just keeps ignoring me. I tried sending him a message on FB asking him if he was like mad at me but he doesn't respond back. I don't have his phone number either. I don't want to keep like trying to talk to him cause he might think I'm like a crazy stalker girl or something. I'm not if you were curious. What do you think I should do. Thanks!