"Avant L'Hiver" (2013 release from France; 105 min.) brings the story of a married couple, Paul and Lucie (played by Daniel Auteuil and Kristen Scott Thomas, respectively). As the movie opens, we get to know Paul as a successful neurosurgeon who spends too much time focusing on his job and not enough time on his wife. Then one day Paul runs into Lou, a bartender whom he had treated once when she was a young child. It is not long before it becomes clear that Lou (played by Leïla Bekhti) has a strong interest in Paul. Will Paul reciprocate? Meanwhile Lucie needs to deal with her unstable sister Mathilde, and Paul's business partner in his private practice, Gerard, seems to have an unusual interest in Pau's wife Lucie. To tell you more of this plot-heavy movie would surely ruin your viewing experience, you'll just have to see for yourself how it all plays out.
Couple of comments: this is a fairly straight-forward relationship drama, focusing on whether the marriage of Paul and Lucie can survive all of the commotions. Contrary to another reviewer here, I did not experience this movie as a "thriller", slow-burning or not... That aside, I absolutely enjoyed the acting performance of Daniel Auteuil from start to finish. He has a natural ability for these types of roles.
I saw this movie during a recent family visit to Belgium, where it had just opened. The screening I saw this at, a week day matinée, was reasonably well attended. No idea if this movie will ever get a release in the US, be it in theatres or on DVD/Blu-ray, but if you have a chance to see this, I would readily recommend this movie to you.