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There has just been a huge argument after Gatsby attempts to get Daisy to deny her love for Tom. Daisy backs away and Gatsby is defatted. As to rub both their noses in this humiliation, Tom tells Daisy to return with Gatsby. This is Tom's style. Having humiliated both Daisy and Gatsby he "lets" them return together in their platonic relationship.
Oh, this certainly shows that Tom is a dominating jerk who wants control in all his relationships. Daisy seems unable or unwilling to stand up to him.