Welcome to the board Thrillisgone. (love the name btw)
I am sorry to hear of the hardship that has come your way. As you know Cluster B PD's in general are a chaotic sort, and the one thing you can always count on is their endless unpredictability. Her leaving so abruptly after so many years is another sad example...
Sounds to me that you always suspected something was seriously wrong with her and had to sustain some great efforts on your part just to keep it afloat. Based on your writings, my guess is the combination of her age/hormonal shifts, multiple stressors, and the allure of new supply enticed her to run. HPD's in general don't seem to do well under any stress for they are already extremely needy/smothering at baseline. Running from life and people who care about them, themselves, and even their own shadow is sadly often the case
My question to you is: Now that she is gone, what are you doing for yourself? Do you have local supports in place? Do you see a counselor regularly?
I am glad you found this board. Many wise souls that can offer support as well
be well