She tells me that she doesn’t trust it- that I’m only being nice and supportive as a manipulative move to “reel her in” until I show my real self and become a monster (which is, of course, my REAL persona)
To be honest, I get lots of those too, when I try to be validating. And because I'm usually terrible at it, I can't really expect the pwBPD to trust me. From experience though, although the pwBPD will say these things, they will not attack you, and in any case, the response is erring on the positive side, and definitely better than if you're being invalidating!