. . . the next minute she wants me to talk about some betrayal. Whenever she hasn't touched a topic for some time, she has to review it again from her current perspective.
These conversations rarely go well and it makes me so stressed I can't be present with the kids. . . . And any response she doesn't appreciate is rejected as false, even though I try to put it mildly. So she indirectly asks me to think again and say something better. Until what I say is based on the truth but isn't the whole truth. I would rather keep to present day but she always wants proof that I am no longer the same person.
Not sure if it's worse, I think she has just advanced in her thoughts. She's on her own path seeking some truth in order to cope.
OK, here's my view of what's going on here. Your wife is re-hashing old grievances. She wants you to "admit" to causing her distress, even if the version of the "truth" she's seeking isn't actually true. And she goes through this routine, over and over again. She's trying to wear you down, to get you to "confess," "atone" and pay retribution. What she wants is for you to validate her distorted victim narrative--that you abused her, you traumatized her, and it's all your fault. Meanwhile, she refuses to accept any responsibility for her own actions.
I've seen this dynamic play out a number of times with the pwBPD in my life. On the one hand, she creates an elaborate victim narrative, one of feeling constantly traumatized by other people. That way, she can blame others for all her ill feelings, while avoiding responsibility for her own life and choices. On the other hand, I think there's a lot of deflection going on. While she's rehashing all the old grievances, blaming you, she won't let go of the past, and in so doing, she's avoiding dealing with the present! My observation is that the farther back in history she goes, the more she's stressed about the present and future. It's a perverse coping mechanism, through avoidance and deflection. It's almost like she's picking on you, to unleash her ill thoughts, as a distraction to avoid actually dealing with the present, but giving an outlet for her chaotic feelings in the process. Oftentimes there's projection going on as well. "You aren't the same person" could be code for how she thinks of herself. Ditto all sorts of accusations: "You're a liar, manipulative, selfish, lazy, unsupportive, a terrible parent!" She's so consumed with feeling this way about herself, that she unleashes these feelings in emotional moments, blaming you of course.
What does this mean? I think it means that no matter what you do or say, she won't feel any better, not in the long term. You might be able to "buy" some moments of relative calm if you give in and do exactly what she wants. But you won't solve the problem, because what she claims is the problem isn't really the problem--her negative thinking and inability to handle her emotions are. Moreover, if you satisfy her unreasonable demands, that just gives her license to make even more unreasonable demands. You are showing her that her outbursts get her what she wants. In the meantime, her expectations of you and others remain totally unrealistic. She wants devotion, attention, money, comfort, praise, adoration, servitude, etc., but to do none of the associated work herself to deserve it. Her expectations are impossible to meet, and so she's constantly dissatisfied, and blames you. Does that sound about right?
I think my advice would be not to get sucked into this sort of conversation, when you've already talked about it and tried to apologize, but she doesn't accept it. You could say, "I can't change the past," and then leave the room.