I am exhausted dealing with my BPD husband

[Exhausted!]

I am exhausted being in a 32-year marriage with a man that has BPD.  Only recently has it been diagnosed.  It would explain why our relationship has been the way it is, and that I'm not going "crazy".
 
I am ready to leave and still find that I am trying to get his reassurance that he loves me and doesn't want me to go. 

This isn't happening.  In fact, I feel like I am abandoning him.  I grew up with a narcissistic mother, which doesn't help things.  We have been in weekly counseling for over 7 months, to not much avail.  I can tell he is trying but I don't see real hope.  I guess my question is what has anyone tried to help release this pattern of trying to "fix" them?