It is not a lack of love but a lack of friendship that makes unhappy marriages meaning. A good marriage must involve friendship as well as love, your spouse is your partner and they should also be your best friend. Unhappy marriages happen because people get married and they stop being friends, letting their relationship decay because of a lack of common courtesy and respect for each other. Some people think that once the wedding vows are spoken there is no reason to continue o be on their best behavior, taking their spouse for granted with the idea that they will always be there and never want to leave. Spouses need to be the very best of friends, always relying on each other and providing support when it is needed. When you stop being friends your marriage will start to become unhappy. If this goes on long enough then the love that existed will die off and can not always be revived.