I learned an emotion management technique from my local paper, in a story about Charles Donald Downing, a centenarian living in York Beach, Maine.
He and his wife--his "precious Irene"--were married 78 years. Although Irene died earlier this year at the age of 97, Charles reported they "never had a fight in all those years." I agree it's hard to believe. Their secret is that they made agreements with each other, and one of them was this: whenever a disagreement arose or they got angry, one of them would get up and get a drink of water. Then, after the pause, they would begin again, discuss things, and come to a conclusion on what to do.