It's not really a surprise to you, is it, that he saw her on this last trip?

Good to know the financial information for your divorce, but don't let her manipulate her - she sent you that stuff precisely because she wanted you to fight with him, and you kinda fell into her trap.

Stick to the high road. Don't get into the crazy gutter with her. Be the calm rational contrast to her lunacy. If only for the sake of reassuring your H that he can find a non-crazy woman in the future, even if you don't want him. God forbid he ends up with her and your kids and grandkids have to deal with her.