I’m not reading anything in your post that suggests this was ever anything like a friendship. I too find this confusing and I’m struggling to make a suggestion. I do think in future it’s a good idea to cut ties at the first sign of unpleasantness on either side.

I’m not blaming you btw because I’ve heard women turn on other women before and virtually attack their personalities- I just don’t get why anyone would call each other friends in the first place if they thought these things about each other.