do you know this movie?

Hi,

there's a movie that i watched a long time ago i don't really remember if it's a chinese movie or thia please help me remember the name ,so the story is about a girl who move to a town and meet a boy live there and fell in love with each other then the girl leave and after period of time  come back and he was  happy about it but he later started to notice that she's diffrent from the girl that he know  at the begining .the movie maybe has a sad ending if i remember