I want you to read what was posted to me as I agonized about my stich, as I saw my H destroying our M and himself after I had given him many chances and he'd just betray me each time. I see what you are saying, you don't want to feel you r abandoning someone in need, but in this case, that someone wont' be saved until she decides to set herself straight.
Start reading from the sixth post down and onto the next pg (in a weird twist of fate, my H was also trying to "save" ow to our/his detriment):