Hi Cpete and

We are glad you are here. It can be very emotionally draining to have a relationship with someone with BPD or traits of BPD. Even just a few traits can make for a difficult situation. We understand here and I hope you will settle in, read some of the articles and threads, and respond to others here. You are not alone.
Has your H's family known that he has (or might have) BPD for some time? Has he ever been diagnosed, or is it just suspected?
What type of support system in real life do you have? Many people here find that it is crucial to see a therapist for our own mental health, as the emotional rollercoaster can take quite a toll.
If you haven't already, a good place to start is by reading the book Stop Walking on Eggshells.
Again, we are glad you are here, and welcome to the family!