Thank you, Marvin, PacMan, JB, Torn and Nas, for following along and taking your time to respond on this thread!
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Thank you for graciously indulging my curiosity, Pacman.

I can tell you I also saw ‘hope’ initially, and I stopped begging, etc., erroneously assuming that I had some influence on H’s crisis trajectory and that a rosy future of our relationship was somehow baked into that trajectory. That’s hope gone rogue and crossed over to quasi-fantasyland.

From my personal experience, I believe that it may help LBS move forward with more vigour if they unhitched the crisis outcome from the relationship outcome. I suggest that proactive and purposeful unhitching does help with seeing the reality, detachment, and, therefore, healing, as it helped me.
Back to ‘hope’ — As Nas kindly explained, using her exquisitely vulnerable personal experience as an example, I believe hope can be positive and therapeutic, as long as one does not cross into the realm of delusional thinking via contorted extrapolation. Delusional thinking is explained as ‘a false belief that is resistant to confrontation with actual facts.’ Yes, cherish hope, by all means, but with both feet firmly planted in reality. (By the way, Nas managed to cram so many important and insightful observations into her post. I’d say It’s worth reading carefully and read it again.)
There was one silver lining in changing my behaviour, which was based my faulty assumption that I had the power to influence H’s crisis, is that I eventually realized how degrading and pathetic it was to beg, plead and cling. I asked myself, ‘lady, where is your dignity, eh?’ Eventually, I got with the real programme — H could not hide his contempt for me, his eyes were firing hatred at me, and then I became nothing to him, just a piece of furniture. Why would I beg anything from someone that does not want me?
About accountability:
When I settled down a bit, the importance of taking full personal accountability for yourself and not putting the blame on your condition/diagnosis/personal or psychological history, the actions of others, group pressure, the societal trends, etc came into focus. Once your eyes are open to this, you can not unlearn this vital lesson. You immediately recognize when you are passing the buck to something or someone else. You recognize with more alacrity when someone else is passing the buck — funny that.
Meandering post as H and I celebrate our wedding anniversary. We talked about how precious each day is, how important it is to not forget the lessons we each have learned, and to live in gratitude.