Hi Emma Lee! Welcome!

Relationships with pwBPD can be confusing and painful -- I call it emotional whiplash. You've found a supportive community here full of people who really do "get it."
I know it can seem utterly hopeless -- I've been there. But things actually can get better. It just takes a lot of work and dedication.
I hope you don't mind if I ask a few questions. How long have you been married? Has he been officially diagnosed and is he now or has he ever been in therapy?