hate the ending, but i love the concept

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I don't get it, she(Charlize Theron)already knew the guy(Keanu Reeves) loves her, why did she still refuse to have him - to love him for the rest of her life - when in fact he only have few weeks left... Studies show that people who are inflicted with incurable disease usually recover once they are happy; when they fall in love and when they find people who will love them and take care of them; when they start feeling needed and that they matter. In this movies, its quite the extreme opposite, usually people strive to get healthy and recover for their love ones...