Hi BrighterDays17,
I just wanted to join Lucky Jim and welcome you to the BPD Family Lucky Jim is right divorcing someone BPD/NPD can be rough and high conflict.(Not always but many of us posting here have experienced this)
Have you gotten as far as hiring an attorney? If you're thinking of leaving it would be a good thing to consult with a few attorneys, tell them your story, ask what strategy they would use to get you what you want, ask them if they have experience with high conflict cases, ask what are some things you can be doing now to help build your case, what does custody typically look like in your state and any other questions you have about the process? Even if you don't file for divorce right now it is good to know what your rights are and some idea of what to expect.
When your done reading Stop Walking on Eggshells there is another book you might want to read... .
Splitting: Protecting Yourself While Divorcing Someone with Borderline or Narcissistic Personality Disorder by Bill Eddy
Also here are some "Lessons" from this board that you might want to check out that might give you a picture and generate some questions... .
https://bpdfamily.com/message_board/index.php?topic=239547.0Please let us know what questions we can answer and how we can support you.
Take Care,
Panda39