When divorces started to skyrocket in the sixties and seventies, the old adage of staying together for the sake of the children became passe. Honesty was considered better for children. If parents were unhappy, they should part, never mind the example of broken covenants. Newer research shows that children have been far more hurt by divorce than was previously believed, emotionally and economically , and in higher juvenile crime statistics, increased childhood depression and numerous other measurements. It is daring and hopeful to marry in the first place, and marriage is full of struggles and disappointments.
Life is long.
As people who try to live well, we must do our best to learn and to grow and to try to stay together. Marriage is not just for being happy, for having well being. It is for salvation, in the sense of realizing our deepest potential as human beings. I think it is not unusual for people to give up too easily. We tend to blame others for the marriage not working.