I got estranged from my parents because my wife and they did not get along well. Towards the end, I would call my mother once a week. I could never make my wife

I got estranged from my parents because my wife and they did not get along well. Towards the end, I would call my mother once a week. I could never make my wife get along with my mom. One day , my mother said something that annoyed my wife. I called my mother and had an angry conversation and hung up the phone. She had high fever but did not call for about 10 days. She died of stomach cancer two weeks later. To this day I am unable to forgive myself for it and regret what I did. My life is so full of such regrets that it becomes unbearable and wish I were dead.