"Here's the ironic part: if a borderline was shipwrecked on a desert island with no one around, she'd develop a real identity, of her own, not a reaction to other people. Sorry, that's not the ironic part, this is: she'd become a narcissist.
The borderline has external markings of identity: tattoos, changing hair colors, clothes. You may recall I said almost the same thing about the narcissist: the difference is, of course, the borderline changes her image as she changes her identity-- in other words, as she changes the dominant personality in her life; but the narcissist crafts a look, an identity, which he then defends at all costs: "I would sooner eat fire ants than shave my mustache." Of course. Of course."
...
"This is why narcissists marry borderlines, and not other narcisstists. Two narcissists simply can't get along: who is the
main character? Meanwhile, two borderlines can't be with each other-- who supplies the identity? The narcissist thrives with the borderline because she provides for him the validation that he is, in fact, the lead; the borderline thrives with the narcissist because he defines her. And, as she will tell you every single time, without fail: "you don't know him like I do." Everyone else judges his behavior; but the borderline is judging his version of himself that she has accepted. "
