What should I do?

Sounds like your friend is not a very good friend if they know you still have feelings for this person and continue to be together around you

Move on.

I am kind of on the outside looking in at this situation. I've liked a guy for a long time, longer than my friend. Well, he went to a different school for a while and then came back. Although we were really close friends before, now he's closer to my friend. So I let her have first try and she asked him out. He said no, that they should just be friends. This was a year ago and she still likes him. I want to ask him out now, but she kind of freaks out every time I mention it. I feel like: she had her chance, shouldn't it be mine now?

What I'm trying to say is talk to your friend. If they both like each other, maybe you should get over it, especially if you feel you never have a chance together. It doesn't make sense to pine over someone you can never have and deny your friend and the guy you like happiness. I have a friend who likes this guy and so does her friend. He told her that he was going to ask her friend out, and, even though she was really sad, she wanted to let them go out.

Honey the wisest thing U can do is to move on.and don't try to forget him because the more U try the harder it gets.just give it some time.keep Yourself mentally busy so U don't think of it. And trust me, if you and the guy are not together,then you weren't meant to be. It's a rough situation but you'll get passed it.
ps:dont act in a way that they think U are jelouse of them beeing together.

Your "Friend" isn't your friend I had the same problem I had a guy I really liked well she liked him to but I had liked him forever and she only started liking him because I did so there you go you basically need to go up to the bitch and be like hey your pretty much not my friend if your gonna do something like that.