Here’s an interesting study excepted from Kahneman’s Thinking Fast, Thinking Slow…
Let’s start with some background … straight from Wiki:
The “seven-year itch” is a psychological term that suggests that happiness in a relationship declines after around year seven of a marriage.
The phrase was first used to describe an inclination to become unfaithful after seven years of marriage in the play The Seven Year Itch by George Axelrod, and gained popularity following the 1955 film adaptation starring Marilyn Monroe and Tom Ewell.
The phrase has since expanded to indicate cycles of dissatisfaction not only in interpersonal relationships but in any situation such as working a full-time job or buying a house, where a decrease in happiness and satisfaction is often seen over long periods of time.
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OK, so is the 7-year itch just folklore for real?
The Homa Files 