What was more, they had taken the first step toward genuine friendship. They had exchanged vulnerabilities.
Arthur C. Clarke
The trouble is that people seem to expect happiness in life. I can't imagine why; but they do. They are unhappy before they marry, and they imagine to themselves that the reason of their unhappiness will be removed when they are married. When it isn't they blame the other person, which is clearly absurd. I believe that is what generally starts the trouble.