I tried to stay

but I can't help myself in this instance.
Phyllis, I don't quite understand what you've posted. She's apparently dying of cancer yet it's said she's not caring enough about herself to salvage their relationship?
To be frank, I'd tell Arthur to take a REALLY, really fast hike home to his beloved one and take care of her. Meaning to take care of her with love, or to talk to her candidly before she has to endure more pain.
Then again...
I'm not there so I don't know what's really happening.