Le Lys dans la vallée (1970)

Félix de Vandenesse's youthful love for the beautiful, inaccessible Madame de Mortsauf, who devotes her life to a half-mad husband and two fragile children. Madame de Mortsauf maintains a friendly, tender relationship. But when she learns of the young man's affair with an Englishwoman, she dies of jealousy and regret.