Why does Tom insist that Daisy go home with Gatsby?

In Chapter Seven, Tom tells Daisy to go home with Gatsby. To put this comment into context, it comes as a result of an argument in which Gatsby revealed that he and Daisy have been having an affair. Despite Daisy's love for Gatsby, she chooses to stay with Tom, much to Gatsby's dismay and grief.

This comment, then, is Tom's way of asserting his dominance. By telling Daisy to leave with Gatsby, Tom shows that he has nothing to fear. He knows that Daisy's affair with Gatsby is over and that she will not disobey him by rekindling their romance.

Secondly, Tom also does this because he wants Gatsby to feel humiliated. After all, Gatsby has just openly admitted his love for Daisy. By having Gatsby escort Daisy back to the Buchanan home, Tom makes it very clear that he is the real winner and that Daisy's true place is with him, not with Gatsby.