Why is my coworker acting friendly again after talking behind my back?

I made a new friend at work and she said she felt like she needed to tell me something personal we really became close she said that my long term friend told her about me that I talk and that the other girl named Kelesha would be better for her as a friend… and kept bringing Kelesha up ohhh I only trust Kelesha etc yet she be trying to be my friend than I found out and confirmed it with her she started going off on me in front of my new friend saying how I sugarcoat things and I do say stuff and basically making me look very bad … after that I just said good morning and haven’t spoke much today and other day she tried to be super friendly and all nice and chit chatty to me I don’t understand if I was that of a bad person why is she trying to get close to me again

Why is my coworker acting friendly again after talking behind my back?
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