Hi bpl53,
Welcome and hello

Mindfulness class is a great way to shore up for now and catch your breath (

), and meanwhile learn not only about BPD, also skills and ways to communicate. That's where these boards can really help. What are the behaviors that are most challenging you?
It must feel confusing that he's a LCSW. Impulsivity goes hand-in-hand with BPD, tho, so even knowing about BPD, your guy probably struggles to control his behavior. Well, we all do, I guess. BPD, tho, brings with it some extra challenges.
BPD also has degrees of severity. Some people with BPD are generally cooperative and not dangerous. Some people have BPD traits, or are sub-clinical. Each of us brings a different set of skills and willingness to work those skills. All of these variables can make a difference.
We're here to be your sounding board as you work through this.
LnL