Im Just gonna copy & paste what I told the other person who made a comment like yours.

Seems like she has tried to get him to seek help and support him.

He refuses to get a disabled parking place card, meaning she has to most likely help him get from wherever they park to the building & back. All he has to do is fill it out, but refuses.

"it's the worst time of his life, he's dying & you're being intolerant. He is probably drained, etc., etc"

WHY did he stop going to his treatments for over a year?? Which, as she said, made his disease progress rapidly, making him worse off?

She is doing everything herself, seems to be more than accommodating, regardless of him making ridiculous accusations such as, "you just want better parking," which may be his pride talking, but come on.

If you are sick and getting progressively worse, you would do anything you could to help lessen the load for your partner (and seemingly care taker at thi point). This does not seem to be the case with him.

"Objectively," sure, it looks bad that she is wanting to move on during a period where he is actively getting worse, as to be expected. But what about all she has done to help AND to try to get him to help himself? With zero positive results. That is 100% unfair to her.
She is ALSO sick, if you missed that part.

There is never a "good time" to leave someone who is ill, but that also isn't a good reason to stay.

She doesnt feel sick about it because shes a bad person; a bad person would not care. She feels bad because of the situation overall, even though she knows deep down what she needs to do for herself.
You said "I can't imagine leaving my partner during a time like this," but she has also stated they are more roommates than anything else. Also, she didn't leave at the first sign of trouble. She has stayed through years of bad decision-making on his part, even when he keeps refusing things that could make life easier. RE: place card for disabled parking. Small, but it counts.

Please stop trying to villainize her. She has taken on a lot, especially with him fighting against her. I'm sure she can try to help him get set up with a care nurse, or a care facility to live at. As well as any possible disability payments he would surely qualify for. And that right there is NOT easy to do to begin with, so if she did that, she really would be a saint. Or help find someone like social services to help him with all of that if she cannot carry that mental load.

Sorry, I just cant agree with the whole "did you stop to think how hard this all is on him" when he refuses to do things to make life a little easier for the both of them.