He tells me he doesn't owe me any explanation as to why. I am having trouble dealing with this fact. I know there are other resources for respite, but I can't get over the hurt. How do I tell mom that he does not want to watch over her? It will break her heart.
Let it go, get other respite but make sure that if there is an emergency, he is the one who gets called by the hospital.
We would all be better off if we would just learn to say, "No, I can't do that" from time to time.