[REQ] Unknown 1970's French movie

[Phuzzy4242]

I saw a French movie once years ago that I'd love to find again. It was about a nerdy overweight guy who still lives with his parents'. He meets a young woman and her daughter (about 8 years old) who are down on their luck and need a place to stay for the night. He offers her his room and he'd sleep with his grandfather. Something to help identify this movie - the woman joked that the guy's glasses made him look like Buddy Holly. The end of the movie finds the three of them on the train platform. She and the girl are going back to her old boyfriend. He's sad but she cheers him with another joke about his glasses.

Anybody recognize this flick? I'm sorry if there's not enough info - it's been at least 30 years since I saw it. Several mild OT scenes.