I would like to steal your idea and make it into a film.  Need help to finish this story:

He proposes marriage; she accepts, believing it is her last chance at love;  she moves, gives up home, family, jobb; but he cools off to the idea in the meantime;  she arrives and finds he has a casual FWB girl;  he apologizes and suggests she return home;  but she has lost face and everything else and digs in to stay;  he agrees she can stay for a while as a guest;  she convinces the other woman to quit; so her competition quits, leaving her one on one with the "fiance".  Then...