I turned my stbexBPDw down for a movie. She had promised me ugly was gone. Nasty was gone. She is in the middle of a text tirade. It's all back. Blame. Accusation. Vitriol. It's criminal. It's unstoppable.
Any and all thoughts of reconsidering in lieu of her post-nup-for-6-months offer should be sufficiently snuffed out by this.
She is proving to you time and time again who she really is. Moreover, this is happening when she knows she needs to be on top behavior because she's trying to manipulate you into giving her something she wants. She can't even keep it together for that.
Because you don't have children with her (you don't, right?), you have the ability to sever pretty much all but the most dire contact. You could even go a step further and require all communication to be done through legal counsel.
The only way to win is to stop playing the game. Just do it.