Many marriages break not because the couple doesn't love each other enough, but because the many trivial matters and minor conflicts in life wear down their feelings day by day, eventually turning them negative.
Of course, the reasons why a couple generates conflict over life's trivial matters can be varied. Affairs and changes in economic conditions account for a large proportion.
The man or woman has found a new lover outside, and naturally, upon returning home, they start to compare their spouse to the "other person". Many faults and shortcomings that they could tolerate in their partner before suddenly become intolerable. This is especially noticeable for women.
