The obvious comparisons are 'Betrayal' by Pinter and 'Irreversible' by Noe. Most extreme goes to Noe, though the brutality in '5x2' is much more personal. Pinter is such a gifted writer that he doesn't have to have his characters resort to physical violence. The violence is in the dialogue. These 3 all have that somewhat sickly sweet endings/beginnings that we'd love to remain in. But life moves on.
A more engaging use of the reverse narrative structure previously employed in Noe's Irreversible, with fall again preceding decline. A tad cold and obvious but nevertheless a decent example of the French talking-heads mode of middle class cinema with enough home truths between the cool exposition to make this generally satisfying viewing. A pair of well judged performances from the leads help lead the conviction.
Interesting idea but I'm left struggling to grasp what the point was really. Maybe that's a dent in my intelligence but it seems like an unrealistically doomed love. Still, well acted, couple of unexpected turns. Could be a lot worse.
Despite the fact that I enjoy how Ozon creates more questions than provides answers throughout this film, it's still too simple and quite dull. I needed more fodder and sadly this film didn't provide. I've seen three other Ozon films, and they've all been better than this.