Hi Bobthebuilder,
Welcome and hello

BPD traits alone can make for a challenging relationship.
I remember one day looking at the 9 criteria for a BPD diagnosis, thinking One of these criteria alone in a loved one makes for a rough go.
Much of what we work on here are the relationship skills that prevent things from getting worse with a person susceptible to intense emotions and interpersonal stress.
And most of the people who come here do not have official diagnoses for their spouses, even if the patterns and behaviors and intense emotions might make them a shoe-in for a diagnosis, if their spouse were ever to agree to therapy.
All that is to say that your story sounds similar to what others here are going through. And lots of support to learn how to better manage what is happening under your roof.
Feel free to share when you're ready, however much you feel ok about putting out there. This is an anonymous board and it can feel, and also freeing to get things out there where others understand what you're going through.
LnL