[Crowbob]

The morality of these circumstances are situational and vary widely. From your post these two men would be considered callous. However, Alzheimer's can take years to completely unfold and the affected person can be 'gone' years before he/she dies. With end-stage cancer, the individual may/may not be aware of his/her surroundings. The ulitmate determination of the 'correctness' is unique to the individuals involved. Had they exchanged vows (i.e., through sickness and in health) there is little question. OTOH, were the marriage simply a document with no commitment between the parties, then its not so bad.

Prior to my entering end-stage whatever, I would have squared up where I stood with my SO. In the end, its nobody else's business.

Yes, it goes both ways.

Interesting that you do not comment on the 'kind of women' the girlfriends are.

(Welcome to PPOT).