Revenge begets revenge. Gandhi said that if everyone followed an eye for an eye, then we are all be walking blind. Taking revenge may sound pleasurable but it does not yield any goodness. On the other hand, there are still some people who do not want to take revenge.
Couples start hurting each other and the relationship starts to get sour. Instead of fixing the relations, they spend more time in making it worst. In fact, some people admit that they take pleasure in hurting others.