I've always felt, from reading all of your well-documented interactions with her, SP, that it's either substance abuse or some sort of mental health issue.
She just ain't right.
When the former spouse dropped the bomb, I was concerned he was in a pre-manic state, which he's experienced in the past. I asked if he considered it. He said no he was fine.
I later asked my lawyer if based on the former spouse's mental history if he could be evaluated before the process went any farther. Nope!
Doesn't matter if you're stable or unstable... divorce is a free for all... well, except emotionally and financially for the parties and families involved.