We broke up over a year ago, and for a really long time she was horrible to me (bitching to my friends, telling people stuff about me etc) but I would be lying if I said I gave a fuck tbh, I have really thick skin and I had made my peace with it being over, it didn't upset me and she looked stupid so i let it slide.  Like 8 months into this our friends are starting to really get sick of it and it's showing, and around this time she apologises and says she knows she's been terrible and we had a nice chat, cool. At this point my feelings are still neutral, although I was glad things were amicable. I could have sat there and been like "oh wow, now that people are starting to get annoyed you wanna make up" but like I'm not going to extend drama, esp when it didn't affect me.

literally 2 hours after this apology she gets drunk and tells one of my close friends something personal about me, which they then tell me. This is the point where I think it went to far, sure I'll let shit slide if it doesn't bother me but I won't be taken for a fool, I ask her to meet me the next day and I break down the last 8 months of awful shit she has said and done to me, demanding explanations (ofc she had none) and basically tell her that she's had her chance and can fuck off. I tell her that I know everything she's said about me. I tell me friends that I'm leaving the group and that I don't expect anyone to come with me, but they all did which essentially left her excluded. To be honest I have to admit that I was almost certain this would happen.

Anyway I kinda realised that it was wrong to retaliate like that, apologised and we left it at that.

My issue is I dont actually know if i'm the asshole here, because my friends, although I love them, are such fucking yes men. Like when she was talking behind my back they never acc spoke up (fair enough they knew i wasn't upset) but then would tell me everything she was saying, obvs giving her the impression that what she was doing was alright. Then when I told them that I was done with her shit they were all like "woo yeh well done. she's been horrible and deserves it". When I decide that my conscience isnt comfortable making someone feel entirely excluded they were like "hmm yh that was pretty fucked up". I wanna add that when I had the conversation telling her that i knew all this stuff, it was a quite clear knock to her confidence that ALL her friends had kinda betrayed her.

So i realise that im now in this echo chamber and it's playing on my mind.  I feel like ESH but i would like some outside opinion because god knows im confused