Brother and husband problem

My husband stopped wanting to have my brother in his life, they had a few misunderstandings which my brother didn't try to address with him which made my husband feel disrespected, so last night my brother called my husband and my husband didn't want to pick up the phone so I asked him and he just said he wanted nothing to do with my brother. I was so upset and angry and begged him to forgive him for the things he never meant to do that upset him, and my husband being a cold hearted, stubborn person would never change his mind about it and wanted to make it clear that my brother should stop talking to him. I never understood why he's so angry with my brother but it's really hard cus my brother is a kind heart it breaks my heart to see this happening. How can I accept this situation? Is there anything I can do? I tried talking to my husband but he's soooooo uptight