Stubborn

I am not sure that my husband acknowledges that he had a heart attack. I make healthy meals but he still yearns for the creamy, high sodium, fattening dishes that he sees on television. His heart medicine gives him headaches, so he has stopped taking it. He has made no effort to exercise. I am doing all that I can. I will not nag him and cause feelings of resentment. Why is he being so stubborn where his health and well being are concerned? I can't help feeling like I am hitting my head against a brick wall.