What is the movie

So I try to find a movie that I watched 5 years ago ..There was a man that moved in a house and in one room there was a girl pretending that she was frightened of getting out of the room..He took care of her for a long time..they didn’t have any physical touch ..he wasn’t allowed to see her ..he used to talk to her through a wall..Eventually he fell in love with her despite the fact that he had no idea of how she looks …In the end it turned out that she wanted to exploit him in order to steal money from him and one day she abandoned him …I would really appreciate it if someone can tell me the movie’s title