Guys i badly need this movie name?

first thing first this movie is not before i go to sleep...its quite a famous movie where a girl in this movie forgets everything after waking up...the hero speak with her one day and next day she wont remember him,her father tells him that she forgets everything like that pls guys help me
Update: the girl lives same life everyday thinking its her or her fathers birthday and she watches sixth sense movie everytime and paint her room everyday
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