Tell them they have BPD. Other option is when you see them, to smile and laugh at them. This will make them crazy.
Oh, I have told him about PBD numerous times when we were together. Now, I'm not talking about this anymore, since he and all his family told me "I was harrassing him with his mental problems."
Strangely, I stopped mentionning BPD/Bipolar 3 months ago... .but they didn't!
He told me a couple of week ago that "he asked his T if he was NPD"... .I didn't answer to that... .
I think he'd want me to care for his moods and mental health, that would fuel his feeling of persecution.
You're right, I don't think he likes if I smile and laugh.
The thing is I AM a smiley person, and he isn't.
I ENJOY life, he doesn't.
This he won't change it.