How do I win my girlfriend back after cheating on her with three people including her best frenemy?(Very long)?

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I've been dating this girl for almost a year and I cheated on her in the beginning, middle and end of our relationship. The last time was with her best friend who has been holding a grudge against her for a long time. Her best friend was the one who told her what happened and then I confessed to the other two times myself. She

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