You cannot DB someone that is truly mentally ill in my expereince. You can prolong the inevitiable.. the thing is though... They will do whatever it is to complete the cycle at any given time.
I am being somewhat simplistic but that is the bottom line on these things. I am so sorry for you if that is what you are dealing with. Reason and common sense fly out the window with this.
I just finished your original posts and am up to speed. There are a few of us here that have dealt with this.. besides me.. check out Mr. High Speed for an example over on the surviving section..
An unmedicated BPD is like a bull in a china shop...