Has he technically been diagnosed as having BPD? I think that you diagnosing him with this might put him on the defensive. He has to be open to seeking treatment for whatever he has - you can't force him into it. But maybe you can help him see how much it's stressing you and your family in a compassionate way?
I will say, nobody wins at the whole "blame game" - that was an important lesson that my husband and I had to learn through several couples therapy sessions. Your husband's feelings are VALID - everyone's feelings are valid. It's actions (outbursts, inappropriate behavior, etc.) that need to be controlled, and that can be done through emotional regulation via Dialectical Behavior Therapy (DBT), medication, therapy or a combination of these.
Speaking from personal experience, what seemed to help my marriage the most (and it's by no means perfect - definitely a work in progress), was when my husband began validating my emotions no matter how "crazy" they were. When I am upset, even if he doesn't understand or agree with it at all, he validates my feelings FIRST by saying something sensitive like "that must be really tough for you" or "I'm sorry you're going through this right now" - then, it opens me up to advice or constructive criticism a bit more and he can say something like "next time, why don't you try..." or "you know you studied hard for this test, what's done is done" - or even if I've done something to upset him.... "I know you mean well, but it really affects my productivity when you call me at work so much in the middle of the day... can you try email and keep the calls towards the end of the day instead?"...
it might be helpful for you to first validate his feelings and emotions in order to open him up a bit more to seeking help for emotional regulation and overcoming his painful past. right now it sounds like your approach is just putting him on the defensive.
good luck!
Nothing endures but change.
Joined: 11-29-2012