Final answer:
Victor copes with grief through nights of vigilant introspection, remorseful reflection, and an almost obsessive rumination on his role in the girl's tragic circumstances.
Step-by-step explanation:
Victor often deals with his grief by engaging in introspection and battling with his conscience. He lies awake at night, wrestling with his emotions and the consequences of his actions. Throughout these excerpts, Victor reflects deeply on his situation, feeling remorse and responsibility for the circumstances of the dying girl.
He even goes so far as to keep a tooth of the girl, as a token of his complex emotions, signifying a mix of sentiment and sorrow. Additionally, his thoughts are consumed by his struggles and regrets, indicating a pattern of rumination as a way of grappling with his grief.