Hello and welcome to the family, January2020!

You've found a safe, supportive place here. BPD is difficult to understand, particularly for people who've never been around it, but we "get it" here.
That's great that you're seeing a therapist. Getting your H to go will be another story, as you've discovered. Many here struggle with that.
Anyway, we have a lot of experiences and tools we can share. Should you choose to stay, we can help you with skills that can help improve your situation. If you choose to leave, we can walk with you through that, too.
In the meantime, there are some communication techniques I've learned here that really helped me in dealing with my H (like yours, undiagnosed). When you feel like it, perhaps you could share a little more detail. For example, describing a recent rage incident -- how it started, how you responded. That can help us get a handle on the relationship and see what tools might be most helpful to you.
Welcome and keep posting!
