What I see online? I spent the first twenty years of my life as a target of cluster-B abuse, trust me I know firsthand.
My advice to all people in range is drop everything and fucking run. Things are replaceable. Jobs and friends are replaceable. Your wellbeing isn’t.
It sucks, you didn’t choose it, it’s not fair - I totally get that, believe me. I have ADHD, it’s a bitch, and it can suck for the people around me.
But the thing is, the fact that it’s not your fault doesn’t make you safe to be around. People can be a danger to others completely involuntarily, despite their greatest wish not to be. And yes, that’s completely fucking unfair.
NPD and BPD are both driven by a great sucking vortex of need-for-validation that can never be filled, and that tortures people if left unfed. NPD is when the vortex demands power or status, BPD is when it demands extravagant emotional connection, but they’re the same basic model underneath. It’s as vicious and relentless as any drug addiction, it doesn’t go away, and it will eventually overpower any amount of good intent. When the monkey’s on their back, all bets are off and the nearest available victim will be preyed upon.
I don’t think there’s a safe way to be in a relationship with that - though I suppose with extremely open communication and amazingly well-defined and enforced boundaries, it could be doable. But this is very much a case of informed consent - it would be supremely shitty not to let your partner know the deal.
Like I said, people deserve to know what they’re signing up for, and there need to be well-established boundaries agreed to in advance. I wouldn’t recommend it personally, but different people may choose differently.
And yeah - if someone just isn’t safe to be around, even for reasons they didn’t choose, don’t want and can’t change, then that’s correct, they shouldn’t be around people. Yes, that’s horribly unfair, but existence just sucks. If you have no moral qualms concealing that danger so you can keep exposing people to it in secret… then you’ve just proved my point.
As for the absusers in my life, kindly go fuck yourself.