The old rule of thumb was that couples got the "seven-year itch":  Around the seven-year mark in a relationship, you begin to take each other for granted and your eye might start wandering.

According to a new survey, that's now down to THREE YEARS.

52% of people who've been in a relationship for less than three years say they still "get together" at least three times a week.  That drops to 16% for couples who've been together more than three years.  And more than half say they even feel like they have to SCHEDULE it.

67% of people who are in three-year-plus relationships say that small irritations that used to seem harmless are now major sources of annoyance.

People who are in shorter relationships say their partner gives them about three compliments a week.  After three years together, that drops down to one a week.

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