Le Cœur à l'envers (1980)

Jean hardly knows his mother, Laure. Following a family tragedy, he had in fact left with his father and traveled the world. Now, at 23, he returns to Paris and finds in Laure a 45-year-old woman who is attractive and freely choosing her lovers. Her latest companion is Guillaume, a gentle, cultured artist. Very quickly, Jean becomes jealous of Guillaume and develops a relationship with his mother that borders on romantic passion. Laure, for her part, is moved by this handsome young man, this son who has become a stranger to her. On the occasion of a psychologists' conference in Spain-Laure specializes in child psychology-she and Jean embark on a romantic journey. But a meeting with some of her son's young friends makes Laure realize the gulf that separates them, and she abruptly leaves him to return to Paris and to Guillaume.