Hi JNChell,
I probably will write my full story one day. My first post here was horrific and I was a bit of a mess. I thought I'd seen the worse but the journey I have had to go through since then with my BPD/NPD MIL and NPD FIL was even more horrific as an effect of them blaming me for my H's 'childhood disorder' his BPD! If that was true I must have been a great sorceress to give my future H BPD 20 years before I met him!
Like so many other people here, I could write a book about it, with no doubt that it would be snatched up by Hollywood . At the moment I'm choosing not to relive it but here is the link to my first post back in 2012.
https://bpdfamily.com/message_board/index.php?topic=181297.msg12099930#msg12099930If I had only been exposed to my H's type of BPD and not my MIL's NPD/BPD and pretty much ASPD as well, I too would have been unaware of how complex BPD could be and would probably be wondering why so many people on this forum site have pwBPD in their lives so different to my H.
With 9 BPD traits, there are 256 combinations of BPD alone, then when you add traits of NPD and ASPD, it can be rather complicated. Adding to that the many pwBPD that also have other disorders such as eating disorders and not forgetting CPTSD.
When my H had BPD, he needed to read up on it seeing that his mother's BPD was affecting his emotions and at times risking his life.
He would often come across comments that would note that all BPD people are like this or they all do that. I had to explain to him how complex BPD actually was and that not everything you read about it is Black and White.
Seeing you are interested in this, below is a website that points out the result of a 2010 study showing a four class model illustrating the cross over of pwBPD with NPD and ASPD. I was just lucky to have a H right up in the top aqua coloured bubble without any other overlap of other PD's. However, looking at the graph, there are plenty of BPD sufferer's like my H.
https://www.quora.com/Can-someone-have-BPD-and-be-a-sociopathIt as well as other similar studies are well worth looking at.
Another such study was measuring the amount of BPD sufferer's that also have NPD and that is full blown NPD with at least 5 traits! It describes two studies. One assessed pwBPD in T (like my H) and found 16% also had NPD. But when they surveyed the population the figure was 39% of pwBPD also had NPD (as pwBPD/NPD rarely seek T). Which is also worth checking out.
https://www.verywellmind.com/narcissistic-personality-disorder-425426I am finding that there are more and more studies nowadays as BPD is actually being acknowledged as being a disorder one can recover from so its well worth institutions pouring money into research.