Horror movie help?!

This is driving me crazy, what's the movie where the parents have their son locked in a basement and they feed him people? And he needs to eat a certain amount of people to be "normal" again. His parents throw a girl his age in there, they kinda fall in love, but I think he eats her, then to make alive again, he starts feeding her with his parents.
I'm pretty sure that's how it goes? The boy and girl become friends because when she gets put in the basement, he is trying to commit suicide and she saves him.

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