This incident reminds me a bit of my parent's divorce. Neither of them acted this way that I'm told, but words that I've heard people tell my father ring true for you, too, Jimbo: not easy to see now, but it seems like you're better off without her.
My mother thrives on drama though will say otherwise, it's her reaction to it that leads me to feel this way. X has this, too. It sounds like you may have a drama queen on your hands and I'm sorry for that.
I'm glad that you're arriving at the stage you're in, for it isn't easy but shows "them" that we aren't doormats. It sounds similar to where I was when I filed though he didn't do PDA's, did other behaviors in cyber space just as public and bad.
Lately, something I think of is the sheer gall that we see and I think I'm close to generalizing so will try to catch it but still make a point-the gall it takes to do this stuff amazes me, to know that a person knows they will hurt another and brutally, but they do it anyway...this I find intolerant and it's what led me to file, as well.
I wish you speedy ends with comfort in sight, on this new part of your journey.
A person is a person, no matter how small. -Dr. Suess
Perserverance and spirit have done wonders in all ages.