How can I deal with someone who I thought was my friend, but wasn't?

Womens are always trying to fit in with the others if they feel that they're not welcome or not good enough. I suggest you just ignore her and be yourself. People like that are a waste of time and breath. I personally just act like I don't know what they're really doing and see how they react to it in the end. But if your friends really see Tessa for who she is then I'm sure they would at least tell her what's up. I honestly don't think u need to say or tell her anything. Like most people do..Just give the cold shoulder or act like you don't know what the heck is going on or maybe you're just better off w/different friends.