I can only say very honestly that the former years of a very happy marriage are wiped out by the recent 10 or so years and that is so sad
Oh annsixty how very sad. I am sending hugs and all good wishes. How difficult it must be for you.
My lovely neighbour (72) is going through the same thing. She has her husband with dementia at home and care workers come in every day to assist but whenever she sees us she apologises in case we can hear him shouting and swearing. (We can't.) She says the man she married and knew so well has gone, he's now a totally different person, and her life with him is extremely difficult, and frightening at times, but her vows mean she will stand by him. I am not sure how long she can do it for - remaining loyal to someone so changed.
In my case, I felt like I'd chopped off an arm or a leg when I finally divorced my husband, a man I'd known for 23 years.
It's a difficult decision to make but if your future happiness depends on getting out of an unpleasant situation then it is the only course of action.
I imagine after 58 years of marriage Katek your neighbours are entering a very brave new world. It makes you wonder why they are giving up that familiarity at their ages, even though the marriage isn't wonderful.
It would be good to know their reasons, wouldn't it? I maintain though, that being alone is better than being in a bad marriage. I regained so much of myself after divorce.