I don't think it is that they don't care, but they can't care. The effect is the same, but it is less personal.
It is hard, and a lot of it only drops into place over time. I can now see how damaged my h is, and how good my life is. Doesn't mean that after all this time I don't still sometimes miss him, but the intense pain is gone. I think it still feels very personal to you - and it did to me for a long time. When that feeling goes it really helps everything to drop into perspective. He won't be happier or healthier, but he won't see it that way for a long long time. To him it is just a few moments in fairyland, but the outside world moves on at its own pace, and when and if they do wake, well it is like Rip Van Winkle. All they have known has moved on without them, and they are superfluous in the world they once cherished. No winners in the MLC game, sadly. But we turn turn our loss into real gain.
There is nothing wrong with having hope. For most people MLC takes a long long time. A good friend of mine's xh is starting to see he has problems, and getting therapy, and talking to her properly for the first time in six years.