Interesting premise. Bruce Willis plays a "hero" of sorts, who doesn't know he's got unusual abilities, nor does he know why he's put on this earth. He gave up a pro-football career for his wife -- but has settled for a mediorce job that doesn't inspire him. He wakes up every morning with a sadness about his life. Obviously it's affected his marriage. He and his wife sleep in separate bedrooms. The opening scene is him returning from a job interview in another city which he is considering moving to. He takes off his wedding ring to flirt with a woman who sits next to him.
It isn't until he meets Samuel L. Jackson, that he begins to realize he may be a hero, put on this planet for a reason. He actually figures this out, and as he embraces "who is really is" (gets a life)his marriage begins to heal.
This is along the theme of men knowing their purpose and task as a necessary component for emotional health/marital health.