Help me

My husbands father is very very sick. And the nurses say he only has a little bit to live. My husband has been so sad and I have tried my hardest to support him and make him feel happy. I know it’s so hard to think of positive things and be happy. But I try to listen to him and let him cry if he needs to. But my husband is angry. Angry about his father dying. He has been taking it all out on me. I feel like his punching bag. He is pushing me away. It hurts my feelings and when I tell him that he makes me think it’s all about me. Am I just supposed to let him treat me like that? Because he’s already having a hard time? He just thinks I’m trying to start a fight. But I really just don’t want to feel like I’m someone he can treat so badly. What would you do?