It passed, and he began to talk excitedly to Daisy, denying everything, defending his name against accusations that had not been made. But with every word she was drawing further and further into herself, so he gave that up, and only the dead dream fought on as the afternoon slipped away, trying to touch what was no longer tangible, struggling unhappily, undespairingly, toward that lost voice across the room.
The voice begged again to go.
"PLEASE, Tom! I can’t stand this any more."
Her frightened eyes told that whatever intentions, whatever courage, she had had, were definitely gone.
"You two start on home, Daisy," said Tom. "In Mr. Gatsby’s car."
She looked at Tom, alarmed now, but he insisted with magnanimous scorn.
"Go on. He won’t annoy you. I think he realizes that his presumptuous little flirtation is over." (7.292-298)
For Tom, forgiving Daisy for her affair is easy; because he doesn’t value their marriage or her love, he sees no need for it to exist untarnished. Gatsby, on the other hand, because of the intensity of his love for Daisy, cannot forgive her for loving Tom; he needs their love to be flawless in his mind.