Naughty Lea (2001)

Patrick (Benoit Clerc) wants to believe his girlfriend Léa (Linda Paris), who portrays her ex-rival Clara (Estelle Desanges) as a perverse manipulator responsible for the disappearance of her previous fiancé. But ever since Clara has been shared by their friends Bruno (Fabrice Darzens) and Virginie (Clara Morgane), Léa has been acting strangely. Could she be the paranoid, morbidly jealous person that Clara claims? Patrick, whose conscience is awakened by a sensitive professional file, doesn't realize he's been manipulated from the start.