It was a mix tbh, and the lives have nothing on the 'debates' that would be had. it did batter my head but it made it heal too and it's given me great anecdotes
Some people think NPD/BPD are two sides of the same coin (like sister signs in astrology), that fundamentally the problems with relationships to self/others are the same, but inverse. it's why a person with npd will crumble and get very 'bdp' when they're unmasked, desperarate to not be rejected/left etc (yknow when you hear a narc guy do the snotty whingy cry after fing furniture everywhere?), and when a pwBpd switches/splits they can get very narc'y, cold, and vengeful.