Just saw it and I think this is what this movie is about... SPOILERS
It is about egocentrism. All the characters, except maybe Cotillard's, are egocentric, selfdriven people. What Louis fears the most, what ends up making him not tell the truth to his family, is the fear that they won't really mind he's going to die. Being world famous, what he ends up fearing the most is the fact that his own family wont care about him dying. At the end, he realizes that dying is just the end of his world.
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