There may already be a posting about this movie, but if so, I can’t find it using the search function.
Not a great movie by any means, actually pretty mediocre, but a clever conceit. The movie traces the relationship between a couple in five episodes that take place backwards. It begins with the divorce, after which the couple retire to a hotel room to have sex, though it is far closer to rape than consensual sex. Then the next four episodes uncover the infidelities and angst of the relationship, before ending when the couple meet (which involves the first infidelity).
It doesn’t ultimately work, primarily because the episodes don’t build to anything or explain the nature of the relationship. The third episode appears to be about the Gilles’ reluctance to be a father, or to be in a relationship, but it is hard to tell since it plays out mostly with him sitting in a car smoking. Still, the movie is French, so it can’t be all bad.
I liked this unique structural device the first time I encountered it in under the title Betrayal as written by Nobel winner Harold Pinter.