It sounds like there's not much communication, not much to go on as to how he's feeling about the relationship? I couldn't tell if he might be feeling bad in himself, not sure of himself in some way/for some reason, or if he's feeling resentful of helping you in your illness and burnt out or what.

I would look for things he likes/wants and go along with those and start conversations from there. My husband has an injured foot and it feels better when I massage his foot and he'll do just about anything in return if I will massage his foot :-) Too, we are in the car a lot together, grocery shop together, etc. and there's opportunity then to talk about things.

The Hershey Kiss incident makes me think he "knows" there's a problem but just doesn't know how to talk about it? It was cute the double, "why do I have to work so hard to get a kiss?" A little troubling that he didn't relent and throw you a Kiss or something. I might have gone to him and done a little wrestling, tickling him and playing "dirty" to get that Kiss from him? A conversation could have come from there?

If I were in your shoes, I think I might want to get a little more insistent and hands-on. Let him know how you feel in a comfortable, non-accusatory manner and see if you can't coax out of him what is going on with him? If your illness has made it difficult for you to respond to him in the past, could be he's a bit burnt out with trying and not getting anywhere? I would maybe initiate hugs and little pats on his back, etc., try to get closer to him rather than wait for him to come to you?