I always think the movie I'm remembering is Goodbye Girl, but I watched it and it's not that one. It is about a woman who will only allow a man to stay with her for a short period. I can't remember if it's a year or a month, but I tend to think it's a year. At one point during the movie she's ready to leave and he's taping the calendar pages back on the calendar so she can't leave.

This has been plagueing me for a while. Please someone tell me the name of this movie!

Sweet November (1968) - Plot Summary (http://www.imdb.com/title/tt0063661/plotsummary)?