Thanks for explaining it more. I kind of figured it might be that way, but was not sure. I agree with the "for better or for worse" perspective and I praise you for embracing that attitude so completely. My first response was based on filling in the blanks as much as possible, based on your descriptions of the circumstances and my own 52 years of very faithful marriage to a woman who is now battling a mild form of breast cancer - cancer is cancer, no matter how serious it is currently. You are a compassionate person and that is definitely a female-like behavioral trait; and one of the best of all.
That said, you do need to have a bit of time for yourself - how much is a personal decision based on the circumstances. Otherwise we tend to shift some of the compassion to a mild form of resentment. That requires the person who is receiving the care to allow time for that to occur. It still needs to be a two way street even if the vast majority of the traffic is traveling only in one direction. Think about it.