When you were here previously, you might have read about the
Karpman triangle This dynamic is bound to come up repeatedly as your daughter enters her teens.
My husband is a lawyer and very attentive to words. When I started using SET with him, sometimes he would beat me to the punch and verbalize the three part process, maybe without the exact details I was planning to say.
That let me know that I had to be very mindful of translating the tools into my own way of speaking. I liken it to playing music. You learn the structure and then you can improvise, like playing a jazz riff.
Yes, pwBPD are particularly sensitive when fearing abandonment and it sounds as if a difference in your behavior is triggering a bit of paranoia in him, and he is rightly concerned as it seems like you are becoming increasingly exhausted by dealing with his dysfunctional behaviors.