Synopsis: The end and beginning of the love of the French couple Marion and Gilles is disclosed backwards through five moments in their lives: 1st moment: They divorce and have one last brutal intercourse without love. 2nd moment: With their relationship shaken, they have a dinner party with Gilles's gay brother Christophe and his younger mate, when an infidelity is disclosed at the dinner table. 3rd moment: The troubled pregnancy of Marion and the delivery of their premature son Nicolas, with the total absence of Gilles. 4th moment: Their wedding, when Marion commits adultery with an unknown guest of the hotel. 5th moment: When they meet each other in an Italian resort and begin their relationship.