In Chapter 7 of The Great Gatsby the reader gets the show down between Tom, Gatsby, and Daisy they have been expecting.  On that hot summer day (which turns out to be Nick's thirtieth birthday) tempers flared and Gatsby demanded the Daisy pick between her and Tom and admit that she never loved Tom.

Unfortnuantly for Gatsby, he didn't get exactly the response from Daisy he expected.

"Oh, you want too much," she cried to Gatsby. "I love you now — isn't that enough? I can't help what's past." She began to sob helplessly. "I did love him once — but I loved you too." Gatsby's eyes opened and closed. "You loved me too?" he repeated.

Instead of getting Daisy to admit that she loves him and only him, Gatsby instead pushes Daisy closer to Tom.  Tom reminds Daisy (and explains to Gatsby) that he and his wife have a history that Gatsby cannot possibly understand, and it is because of this history he knows that his wife truly does love him.  Convinced that Gatsby is no longer a threat to his marriage, Tom has Daisy and Gatsby drive back home from the city together. A further insult to Gatsby that the girl for whom he has built his entire life, is still out of his reach.