In addition to what Alexandra has shared, I might also suggest that a person's feelings and opinions towards another can be changed over the years by experiences.
In the U.S. many believe that marrying young is a bad idea because the individuals are sure to grow and change. Sometimes when that happens the couple finds they are no longer of like mind, they no longer feel and want the same things they did when they were young. This causes unhappiness and often divorce.
It happens to older adults too though. Hardship, trauma, loss and more can cause people to change and make changes in their lives.