Tonight I'll Sleep at Yours(2007)

Overview:

Alex and Laetitia appear to make the perfect couple. But, as much as he loves his gorgeous fun-loving sweetheart, Alex isn’t yet ready for her to move in with him. Laetitia has other ideas. She has already packed her bags and lets Alex know that she will be taking up residence in his apartment within a few hours. For Alex, this is his worst nightmare come true. In desperation, he persuades his best friend to simulate an attack of depression so that he can move in with him...