Idk man. She sounds like a major player and you seem to be falling for her. The worst thing about us guys falling for a girl who hangs out with other dudes is that we get jealous by everything you know? So maybe you saw things different and she was just having fun. But whenever she is a player or not you can't jump into a relationship because she attracts you. Because after a while you start seeing what you don't like or she might hurt you without knowing it because for her it's a normal thing. Bcha like Anonymous said talk to her about it. It will be easier to pull out of that relationship when you have not already fallen. So my suggestion is conversation bro. That shit solves a lot. And also pay more attention. That way you'll know more about her behaviour and her habits and her likes and dislikes while you decide whether she is right for you or not