I’ve read somewhere that the most successful approach is actually to run in the opposite direction with a coldness that defies logic.
The day she BDs you, kick her stuff out the bedroom, block her on socials, tell her she has 48 hours to leave the house, tell her that you’re having 50% custody of the kids, and that you’ll forward your lawyer’s details as soon as possible.
For a second bomb day, that’s pretty much your only option.