His wife and his mistress, until an hour ago secure and inviolate, were slipping precipitately from his control.
If there is one thing made clear about Tom in this novel, it is that he loves and needs control. This becomes clear through the way he drags Nick around the city to his domestic abuse towards Daisy and Myrtle. And right now he has no control, since his wife is speeding away with another man, and his mistress is leaving town soon.
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