Ok this is so weird but like how do you expose fake friends for talking about you? I know they did it but i dont know how to talk to them.

Ask them if you can talk in private. DO NOT TEXT THEM (they can screenshot and send to other people). When you get them alone, make sure nobody else is around and then tell them that you know that they’ve been talking about you behind your back and you don’t like that. Tell them how you feel and ask them to stop (I know it’s not always that simple). If they continue, or make fun of you for it, then drop them. Stop talking to them, ignore them, but don’t talk about them behind their back. 2 wrongs don’t make a right