You may want to watch the Korean movie A Moment to Remember. It's about a rich girl who got stood up in a train station by the man whom she wants to build her future with. In the course of trying to pick herself up, she met this carpenter guy, who's apparently working for his dad.
To cut the long story short, they both fell in love with each other; however, the girl's family won't approve of it, as they come from different social classes. But even if such is the case, they fought for each other and decided to build their own home.
Years has passed and the girl suddenly become so forgetful to the point where she even calls her husband with the name of the guy who stood her up. The progression of the disease has become a massive burden for both of them but the guy didn't give up. He continuously think of things on how his wife can always be reminded of him, of their marriage and of their love for each other.
Watching this movie will not only make you feel sad but will also inspire you, and will make you believe in the power of true love.