The borderline patient requires an intimate partner who would partake in her approach-avoidance dance. Only the narcissist fits the bill. When the borderline is in the throes of her abandonment anxiety (separation insecurity), the narcissist regulates her emotions and stabilizes her labile moods with his lovebombing and idealization. When the borderline experiences engulfment (enmeshment) anxiety, he obliges by devaluing and discarding her, pushing her away. The twin cycles are compatible and feed on and off each other. Find and Buy MOST of my BOOKS and eBOOKS in my Amazon Store: https://www.amazon.com/stores/page/60F8EC8A-5812-4007-9F2C-DFA02EA713B3