Remember that above everything love is a behavior & not an emotion. What most people classify as love wears off in four years as Evolution intended in order to propagate the species. Anthropologists speculate that most relationships end at four years as endorphins wear off because when we were evolving it took approx. that period of time for a child to become bipedal in order to escape predators, hence we sought other partners to spread the genes. It's the four year "itch" and not seven.
As the ol' dance floor maxim goes "baby, if you don't feel I love you then feel a little lower!!"