L'Emploi du Temps

Saw L'Emploi du Temps. It was about a man who is fired from his job and is too embarrassed to tell his family or friends. A sorrowful movie. There is a recurring image of the protagonist standing outside at night, looking at people living secure lives through windows. I was unfortunately confused by the ending. Was it supposed to be a cruel glimpse of the job-interview that ultimately lead to him being fired, or was it hopeful vision of things to come. Or was it meant to be delightfully ambiguous?