Cally... he doesn't want to tell people that he left on his own because that would be taking responsibility. And listening to your needs and responding...that's taking responsiblity. And drinking with the kids...well, you get the picture.
You are in a tough position...hopefully the medical crisis will spur some action in him. However, I would also beware of depression settling in, and in men it can take a particularly " hard to read" form---anger, irritability, etc. Hope he's feeling better and that you are taking good care of you. It's fine to enjoy the male attention...just be careful because you are vulnerable right now. When you are ready you will address the issues again.