Hi Liebe,
Welcome and hello

Glad you found the site and sorry for what brings you here.
30 years is a long time to live with someone who has BPD. Does he know he may have the disorder?
You're wise for knowing that it takes planning and precaution to leave what could be a high-conflict divorce. Many of us have been through divorces with spouses who suffer from BPD and are here to help walk with you.
Have you read Bill Eddy's Splitting: Protecting Yourself While Divorcing a BPD/NPD Spouse? That's a book most of us read at some point. A lot of it is oriented toward custody issues, but it's still helpful, if only to help understand how to family law courts work when one spouse has a PD.
How is the relationship right now? What is the biggest aggravation you are dealing with?
LnL