Hi there @Hibiscus1,
So nice to meet you 😊
You are right, I believe that people with BPD can differ. No two people with depression or bipolar etc are exactly the same, they simply share some of the hallmarks of a diagnosis.
To your second question, I would think you could ask your family member or friend what they struggle with, and if they assert a boundary not to discuss it then I might respect that decision.
To your question "Do we really give in and few hurt regularly, to keep the peace as suggested", I believe carers have a right to respect, the same as those with BPD do. Having lived with a loved one with BPD, I found this aspect difficult to navigate at times. My best advice is to honour your needs alongside theirs, and in the times where you feel that is increasingly difficult I would reach out to professional support for advice on how to navigate your particular circumstance. That's what I did and I felt if nothing else it was a space where I could vent my feelings without escalating with my loved one.
Hope this helps 😊