L'infedele (2000)

marianne, a young woman, confides in a writer telling her story. married to markus, a famous conductor, he betrays him with director david, her husband's best friend, sparking a war of pettiness and low blows. but marianne is not the only one guilty of deception, and in a tragic massacre game the woman soon becomes the victim of the man for whom she abandoned her husband and daughter.