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Answer: mistreated him
Explanation:
The excerpt explicitly states that Tom´s aunt has mistreated him when Tom imagines what his aunt´s reaction would be if he died. He imagines her promising "she would never, never abuse him anymore", indicating that she has mistreated him before. Although Tom’s aunt and guardian love her nephew, she struggles to discipline him, which seems to have taken her to mistreat him throughout his life. She did rescue him, but his excerpt doesn´t refer to that. She doesn´t have anything to forgive Tom for, nor has she apologized to him.
