The reality here is that if someone has a serious illness or a disability it isn’t just about them, no matter how much they are the ones who are struggling.
If you have a chronic illness/disability then everyone around you has to be a part of that, and there come times when they will also be negatively affected by it. And if that person doesn’t help themselves, why should those around them bend over backwards to be there for them.
If someone posted on here asking whether people would date someone with a chronic illness a large majority would say no. So it’s not unrealistic to understand that a person who already lives with someone with that chronic illness is going to find that hard as well sometimes.
I am in heart failure and when I was at my worst I couldn’t leave the house. Sometimes walking upstairs would mean I’d overdone it and I would spend the next 15 minutes trying not to throw up, and wishing that this would just get on and kill me since it was likely to end up doing that anyway so could we just get there now please. I never considered taking steps to end it myself, but I was perfectly ok with the idea that nature might like to take its course now thank you. . And this meant that my DP/DS had to go to the shops/run downstairs to fetch my anti emetics/water etc and sometimes we had to get a takeaway because I was too ill to cook. Or DS had to get up on his own because I was to ill to get out of bed.
I am in a much better place now, and while part of that is because of interventions, another part is because of the meds I take, and the impact they have. If I stopped taking my meds I would slip straight back into fast AF (atrial fibrillation,) my stats would be all over the place, and the breathlessness and exhaustion would return, and worse, when I reach that point (and I have been told that there will come a time when I will reach that point, regardless of the meds) I am ineligible for any other treatments other than a transplant.
So if I suddenly stopped taking my meds then it would be perfectly understandable if my family started to roll their eyes when I complained that I was breathless/feeling sick, and expected them to take over because I was no longer capable.
If he’s refusing to take his meds etc then clearly he’s not actually taking his condition seriously enough, and I would be telling him that he is seeming to be deeply unattractive and really needs to do something about managing his health because you’re not going to compensate for it given that he doesn’t either.