Hi kirm,
Having two people with BPD in your life can be really tough! It takes a lot of strength to not be emotionally injured in a BPD relationship, and having two at once can compound the challenges.
I wonder if one of the reasons your husband feels better when he sees his therapist is because the T validates his feelings? You can read a little about
validation here.
People with BPD struggle with extreme rejection sensitivity, so abandonment is perceived much more acutely than we might experience ourselves. And when their emotions are activated, it can take longer to return to baseline. Our challenge is to stay grounded and not get on the emotional roller coaster, and there are skills and lessons, plus lots of fellow travelers here that can help us with that.
Glad you found the site and hope you'll post more when you feel comfortable.

LnL