Ok So there was this guy that I liked a lot! Everyone knew I liked him a lot including one of my best friends. During our senior year I started to get this vibe that she liked him a little bit. So I said something to him. I said, "Hey I would like it if you stopped flirting with my friend" He said sorry. (Sidenote: He and I were never official but we were basically together and she knew that we were messing around) So one day I asked her if she liked him and she said omg I would never touch him I would never do anything to jepordize our friendship. So they were at this Halloween party that I opted not to go to and I get this phone call that those two made out! I was so upset I asked her about it and she lied. So did he. So I just said forget it. Finally I was hanging out with the guy and he admitted it to me and all of senior year she lied about it. So when summer was over we were all at this party before everyone went away to school and my best friend walks up to me and says go open the bathroom door and sure enough they are making out in the bathroom again! So this time they knew I saw them. So the next day I went out with her first love! She was crazy head over heels for this guy she lost her virginity too but he didn't like her at all. They stopped talking to each other months ago but I knew that would hurt like she hurt me! And now we aren't friends we haven't spoken two words to each other and I have seen her several times! Was this whole thing shady and I shouldn't worry about it?

Being vengful is not a character trait of mine I was just soooo upset

She was not a good friend to you and you are better off without both of them in your life. However, you compromised your principles when you messed around with her ex. You used him to get back at her. That makes you no better than she is.

Next time, just be the bigger person and end the friendship based on the fact that she was a liar. You will get a lot further in life this way.

Forget ALL of them and get on with your life. They lied to you and it doesn't sound like you can truly trust either one of them.