"When it's over, it's over. You have to leave." Like when your cat dies. There's nothing really keeping you there. The relationships have run out of steam. Like Chinua Achebe says, "Things fall apart." The main part I didn't like was being lectured at, whether I agree or not.
I have never considered Denis a straightforward filmmaker, though she does beautifully utilise simplicity. That alters here, where her refinement from abstraction after 'L'intrus' leads to a film where the purpose is a little too literal from scene to scene. That said she made me feel completely a theme I'm often alienated by in film: familial obligation. The space allowed characters is what provides its humanism.
My first Denis film left me breathless, angry, entranced and ready to watch it again immediately. "They're closing anthropology; they say it isn't important" might capture this quiet largesse which deconstructs the pains of growing apart at such a life-like pace that it's easy to miss.