This has been on my mind for a while

So I really like this guy. I'm sure there's a billion posts like this on this subreddit. All I want to do is get over it, but I can't. I constantly think about it and it makes me very mad and frustrated. I think he likes me a little, but it's so hard to tell. He's one of my best friends. What should I do? Should I just get over it? Thank you for reading this.