NLT - are you looking for advice? How well protected are your assets (this is not a joke!) Is the post nuptial designed to protect you and can it be enforced if you were to divorce or legally separate further down the line? (Worst case scenario) If he may be losing his job and OW is not working and expects a high standard of living then you may need to consider whether you need to take legal steps to protect your share of the marital assets at this time, and not in several months when the outlook may not be so good.
The are crazy aa this latest round amply demonstrates (A really bright man 'not understanding' the meaning of a legal separation - dear me!), and while they may or may not sound nice when they talk to us, what they are doing to our lives isn't fair or kind.