@Bonniethewestie
There's a few points in your post I'll reply to. I can see where you're coming from, and I do appreciate the points you're making, but some of them are misguided. I'll be the first to admit there is massive stigma associated with a diagnosis of PD, with repercussions one can feel in pretty much every aspect of life. Aside from social/romantic situations, I myself have been excluded from psychiatric coverage on my health insurance when I lived abroad because I disclosed my previous diagnosis of BPD. I know there is stigma, and I hate it.
That said, a lot of my replies will be advice to others with BPD (who I'm assuming you're talking about, and not those with ASPD or NPD), and to OP.
> Can you imagine being with someone for a year and a half in a happy relationship. You are about to make the next step to move in together, you reveal your past diagnosis off your back and it’s clearly something which is big for you to share. Your partner ends it with you because of that label.
This is different for me because once my clothes are off it is obvious I have had mental health difficulties and we need to have the conversation early on, but I can't imagine getting to 1.5 years without a person I was genuinely into not knowing about my past difficulties. If you have BPD or any sort of emotional dysregulation disorder or a history of depression, my advice would not be to hide it infinitely from your partner/potential partners because you're afraid of judgement. Living your life in fear someone will leave you when they discover "the real you" is only feeding into your problems. Early on mention you had troubles when you were younger/currently have troubles. You don't want to be with someone who is on a different wavelength and will judge you for it anyway. If someone breaks up with you because of your mental health difficulties then they weren't the right person for you anyway. Always bear that in mind.
> They’ll be so many people that read this thread and feel absolutely crushed by it. People who aren’t responding but now feel scared to speak out and reveal something.
I hope not. Even in the initial OP she says he has a personality disorder with a bad rep, very clearly meaning anti-social PD or NPD. None of that read to me like it was about BPD. When I was actively ill and very much exhibiting symptoms of BPD, I went out with a guy for years who was in the same boat, and we were terrible for and to each other, I didnt think OP was referring to BPD in her boyf, and I have experience of BPD in men. It was clearly about either NPD or ASPD.
> Anyone with a mental health struggle might be vulnerable to suicide and reading the things people say on here could cause someone very real and serious harm.
The same might be said for more than half of the posts on mumsnet. I don't think encouraging vulnerable young women into the arms of sociopaths or narcissists is quite in line with the harm reduction you're pushing here. To anyone with BPD or a history of depression, do your best to protect yourself in the best way you can now. A big part of that is learning about who you should let into your life, and we tend to be more vulnerable to abusers than most, given our particular struggles. You don't need to be a bleeding heart and stay with someone who is a narcissist or a psychopath because you're worried about hurting them. Take care of yourself because not everyone will. Be smart. This advice is for everyone, not just those with additional vulnerabilities.
OP, there's not a chance in hell I would be with someone who had either NPD or ASPD. To me, him telling you he has it is a manipulation tactic, he already knows you'll be with someone who has a violent past and can demonstrate extreme anger, which is something most women wouldn't be comfortable with. If you stay with him, be really wary. I personally wouldn't move in with him but would continue to see how it goes while maintaining my own space.
There's a very good book called the sociopath next door, have a read of it OP. Good luck.