To people who suggest Heather should (wo)man up and get rid of him, you should understand just how debilitating a severe stroke like this is.
Firstly, there are of course the physical consequences of partial paralysis and aphasia (the frustrating situation where you know what you want to say but can't find the words anymore), often also with short-term memory loss. In Heather's case, there also seems to be diabetes which in itself requires a whole new way of living.
Mentally, there is the scary prospect that it might happen again, setting you back or killing you. You have no idea how much you will recover and how long it will take. Meanwhile, without insurance, the bills just stack up. I suspect one frequent consequence of severe stroke must be depression.
Normally, people can get through surprisingly well with 6-12 months of professional revalidation and coaching, augmented hopefully by their social support network. Here a useless waste of oxygen for a husband is not a good prospect of course.
Just about the last thing on a stroke victim's mind, though, must be starting divorce proceedings in the middle of the recovery process. And no matter how hopeless the guy is, he is still a known factor from your previous life to hold on to.
The lass is well and properly done for.