Hello Optimistic: I'm not the member you're looking for here on PC. But I noticed this is your first post & you had not yet been greeted. So... welcome to PsychCentral.

One other forum, here on PC, that may be of interest (& where you might also consider posting with regard to this) would be the relationships & communication forum. Here's a link:

https://forums.psychcentral.com/rela...communication/

And then here are links to 9 articles, from PsychCentral's archives, that hopefully may be of interest. The first 7 are on the subject of BPD. The last two discuss how to persuade a loved one to seek professional help & how to help a loved one who is in denial:

Living with Borderline Personality Disorder

How to Help a Loved One with Borderline Personality Disorder, Part 1

How to Help a Loved One with Borderline Personality Disorder, Part 2

Living with & Loving Someone with Borderline Personality Disorder

https://blogs.psychcentral.com/careg...e-personality/

https://psychcentral.com/blog/6-gift...lity-disorder/

https://psychcentral.com/lib/an-over...dium=popular17

https://psychcentral.com/blog/how-to...essional-help/

https://psychcentral.com/blog/11-way...-denial/?all=1

I hope you find PC to be of benefit.