Can you tell us a little bit more about your situation? Are you still living in the same household as your BPD spouse? Are there children involved? Although this is not a forum for professional legal advice, we have a lot of members who have been through some tough situations that can listen, understand and help... .Please post back and let us know how we can support you through this process.
We try to have the Family Law board as anonymous as possible but we still need an idea of what sorts of assistance you need. For example, if you don't have children together then your conflict won't be as complicated since there won't be custody and parenting issues to resolve.
Randi Kreger and William A Eddy are very helpful resources. Their book
Splitting: Protecting Yourself While Divorcing Someone with Borderline or Narcissistic Personality Disorder is one of our best and essential handbooks.
While we aren't lawyers and can't give legal advice, we've been there, done that. We have collective wisdom from our past experiences. We have found that some approaches and strategies generally won't work while others generally do work. Tap our brains and avoid much of the chaos, self-doubt and indecision.