I was going to write a review of this, but there is little I can add to Peter Shelley's very perceptive review (at Amazon's video store). I will relate my experience with the video. I chose it more or less at random, as I sometimes do (in this way I try to extent my horizons, or at least to come face to face with something different), but partially because it starred French actress Isabelle Huppert, whose work I admire. As I shifted in my seat through the languid development, I thought how odd and how out of sync with a modern story this is! Strangely coy and even "Victorian" for an Italian movie! After some time it occurred to me that the only explanation is that it was adapted from an eighteenth century novel! For some reason The Sorrows of Young Werther came to mind. When I discovered that Elective Affinities was indeed based on a novel by Goethe, I was very pleased with myself until I noticed on the video jacket a reference to Goethe that I must have read and forgotten.
Let me quote a passage from Goethe's novel, Elective Affinities (1808) found in Bartlett's Familiar Quotations that goes a long ways toward explaining why Carlotta (Huppert) does not immediately divorce her cheating husband and take up with the dashing architect: "The sum which two married people owe to one another defies calculation. It is an infinite debt, which can only be discharged through all eternity." Carlotta represents Goethe's point of view.
I would also like to note that this is not Huppert at her best. She is too much long of face, and that sly cynicism of hers is a little too much on display. Additionally (I guess I can't help but review this a little!) the self-satisfied privilege of the upper classes depicted here allows one to understand the reasons for the revolutions that would again and again threaten the old order in Europe throughout the nineteenth century and into the twentieth.
(Note: Over 500 of my movie reviews are now available in my book "Cut to the Chaise Lounge or I Can't Believe I Swallowed the Remote!" Get it at Amazon!)