emotional starvation

He and I have been together 2.5 years. He just reclaimed his love for me after our second break up. He became sick w a painful illness about a year and a half ago. I want to just stop talking to him, I am fighting not to be depressed every morning - everything we wanted together - a baby, seems like a different world entirely now. I'm exhausted from trying and doing and chasing to make sure he is okay. He literally gives me nothing in return now, except some words and a mostly daily phone call usually filled w his pain number rating and challenges that day. it used to be so great between us. Do I hang in there ? I am not the type to just give up but now I'm feeling like I'm losing a sense of self respect. When I have told him I need more then this he gets very upset - says he can't give me more. It drives him crazy to think he is making me unhappy yet idk any girl who would be happy on this starvation diet. what do I do?