(If you want a shorter synopsis, analysis of themes, or information about where to watch it legally in your country, say which one and I’ll provide it.)
When Edward discovers the affair, the tragedy lies in his realization that logic and stability cannot compete with the raw passion Paul offers. The climax of the film, in which Edward confronts Paul, marks the moment the "thriller" elements take hold. However, the violence is not glamorous; it is clumsy, desperate, and sad. Edward kills Paul not out of hatred, but out of a profound sense of emasculation and loss. The act of murder serves as a dark mirror to the act of adultery; both are transgressions that irreversibly alter the trajectory of the family’s life.
Unfaithful has been released on theatrical, DVD/Blu-ray, and various streaming platforms. Availability varies by region and service.
If you type into your browser, you will likely find the movie. You will watch Diane Lane’s Oscar-nominated performance. You will see the snow globe fall. But you will be watching a ghost of the film—a compressed, low-resolution echo that cannot replicate the theatrical experience.