The Disenchanted (1990) on Netflix

Plot summary

Bêth keeps a household running in Paris for her bedridden mother and her younger brother while she finishes school at seventeen. Money arrives in occasional checks from a doctor who calls on her mother, and he has begun to show interest in Bêth herself. The boyfriend takes her for granted and tells her she should sleep with another man, uglier than he is, to prove her love. An older man named Alphonse steps in when the boyfriend quarrels with her beside the Seine, and when she goes to see Alphonse the two of them talk about poetry. A boy she meets at a disco takes her to a large house, and Chang, an artist of her own age, is a friend with no room for her.