Congratulations for having a good relationship with all of those three people that suffer from BPD. You could even write about it in the success stories thread. But does your daughter live with you? I'm guessing she doesn't.
The whole point of this thread is how to handle it when the pwBPD wants to keep destroying your well-being and they are in the best place to do so, in your bed.
I don't think you can find someone who is living with a BPD partner and is able to make it work using just skills and compassion, because this is impossible. Unless they are under a serious threat of separation. The threat is only taken seriously if it has already happened before forcefully, and it can clearly happen again at any time, forcefully again.
My wife says she suffered a lot on every occasion in which she was away from me. But I think she didn't learn any lesson from those experiences because none of those occasions was a forceful separation.
Here you're actually talking about a boundary without putting a name to it. She wants to manipulate in order to punish you, but then realizes you're pulling away so she cuts it off and reverses course. During that time though, she's becoming dysregulated because you're distant and if you don't swoop back in....boom.
Yes, being detached can be seen as a boundary, but it doesn't really work when living together, because I'm at a close distance. So she can just keep shouting, cursing, throwing objects at me, using the kids in different ways to provoke me, or throwing stuff in the trash.
But your understanding of her behavior is not precise. What I said about her walking nude and being unwell is not manipulation. It is a genuine and automatic behavior that she does when she feels the need for proximity, even while she is still very angry.
I'm self-sufficient to a point that I don't need her affection. I actually feel relieved when I am a few days away from her. So she isn't able to manipulate me at all, but she can easily turn my life into hell regardless, only because we still live together.
You said "if you don't swoop back in....boom", but that's not true. She has never exploded because I didn't "swoop back in". What I said is the opposite, that she turns down the volume when I'm distant for too long.
After I keep myself detached for many days, she stops getting angry at the flip of a hat and then starts using different tactics. She may sleep on the couch, hoping that I'll feel lonely, may make theatrical acts to make me jealous about other men, or may turn into a kind and lovely wife.
For a very long time, I have been planning to keep myself emotionally distant from her, permanently, but I always end up relaxing and forgetting about it.


