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Sam never had a mother.
His mother is a ghost, a fairytale. His mother is a secret and a false god.
He learns that he was meant to be a lamb to the slaughter. He learns that his birth was for the purpose of dying and not of living. He learns that his mother sacrificed his own soul to be damned.
He still loves his mother.
Mary is alive. Mary is real. Mary is right in front of him. She doesn't know him. He doesn't know her. They love each other because they must. She doesn't talk about the deal she made. He doesn't talk about his childhood and his time in Hell.
Mary wants to be forgiven. Sam wants to forgive her.
They don't know how.