Louis says he loves Claudia and can't live without her, although this doesn't stop him flirting with a woman at the theatre where he is working, nor with a woman in the cinema. Meanwhile Claudia seems even less interested in a monogamous relationship, casually picking someone up in a bar.
With regard to the film's title, Clothilde is jealous, for obvious reasons, while both Louis and Claudia also exhibit feelings of jealousy, each it seems suspecting the other of infidelity. The little girl, Charlotte, adds some innocence to what is otherwise quite a sombre film. She is, indeed, quite charming.