I did not try to imply that friendship could not exist between you should M eventually end. I just have a hard time hearing that “friendship” BS from WAS at this very time after they have destroyed, cheated, disrespected, etc.
I would simply say : “I am sorry but friendship is not what I can consider right at the moment.”
Angry=frustrated=skeptical=selfish
She is angry at herself. You may want to think about why that is, but you can’t stop her from being mad at herself. Only she can do that.