I'm not sure who and what's being validated and what's not. In general, appeasing is a slippery slope. If you start giving in just to minimize the incident, it will likely enable or incentivize more demands to approve the other's perceptions, viewpoint or demands.
Boundaries are a way to set a demarcation between perception and reality. Here is the index of our Tools & Skills workshop board. Among the many topics are two threads on
Boundaries, and another on
Are You Supporting Or Enabling?https://bpdfamily.com/message_board/index.php?topic=329744.0Granted, being the savior vs persecutor in a
Karpman drama triangle where your spouse morphs between persecutor and victim, is an almost impossible task. A reasonably normal person would learn after bumping a few times against a reasonable but firm Boundary. PwBPD (or other persons with acting-out PD traits) are resistant to proper Boundaries, will claim you're controlling, and demand you cave to their self-centered perceptions.
That's the dilemma we face here, what do you do if the person never "learns" reasonably normal behavior and perspectives. When there is such a total lack of response and cooperation, eventually the only effective option is to end the adult relationship. Yes, you share children but parenting does go on if the adult relationship (marriage) ends.