There's a guy who I think likes me. He stares at me all the time, and shows off, but he and all his friends unfollowed me on instagram. Does he like me?

Best thing to do is go up and talk to him ! Instagram doesn't much count for how people feel, it's just a website. Talk to him ! If he likes you then you'll know either way. Following or unfollowing on these sites means nothing. It's what's inside of you both that counts. Talk works much better.