I hate those screaming matches, nothing ever good comes out of them. It's even harder when kids see it all. Sounds like when you reminded her she was in control to leave, she gained control of her emotions... .?... .
Such a big question... .
So, when a loved BPD spouse needs help, knows they need help, but will not get it or stay with it, what can you do?
I pray. That may or not apply for you, I'm just saying, it helps me a lot.
Perhaps she doesn't believe she really deserves the help? You can't help them change, that's for sure.
But you can help build a loving, nurturing, comfortable place for them to want to change. An example to follow. The best thing you can do, is do whatever you have to to make life better for YOU, and to help her understand how deep your love for her is. Learn what belongs in the BPD folder, and what belongs in the 'her true heart' folder, and live life accordingly.
Merry Tuesday and good intentions to you, Cole!
c.