*FOR GETTING BACK 2GETHER WITH HER BOYFRIEND?

sorry if my post isn´t very eloquent </3

- - -

Recently my Mother's ex broke up with her. He was being very verbally abusive towards her towards the end of their relationship and it turns out, he has threatened to kill his ex gf in the past.
I don´t want to be too specific, but he´s basically threatening me (believe me or not I have done nothing wrong), and will make good on his ´promise´(his own words), unless my Mom takes him back.
Yesterday; my Mom agreed to be his gf again. I was infuriated, towards him and her, for doing that. I got angry and told her ´that´s rlly stupid´, ´no, please don´t do that´, and I guess, commanding her to break up with him. Thats just the gist of it and I do recall calling her stupid at some point.
She did break up with him, but now she has been acting really bitchy towards me, for lack of better words. She's constantly nitpicking me, she refuses to talk about the event and how it made me feel etc.
I suffer from anxiety and this ordeal is taking a toll on me.

So, AITA or no?

*will probably delete soon, please feel free to share ur thoughts