Tom and Daisy would never leave each other because that is not something people of their social standing do; divorce is not an East Egg custom. Tom has just found out about the death of his mistress and is undoubtedly distressed. Daisy is confused and used to being bullied by Tom. Even though she told him off at the hotel earlier in the chapter, it is obvious that she will stay with him. Gatsby has been a happy diversion, but his past and his garishness won't fit into her idea of high society. Nick can even see this, and he tries to pull Gatsby away from the Buchanan's yard. But Gatsby, much as he was earlier drawn to the green light at the end of the dock, cannot leave the idol of his love. Now there is no light, though, as Daisy does not give Gatsby the signal he was hoping for. Gatsby ignores this, and the quiet conversation the couple is having, seemingly already mending their broken relationship, if only for one night. The pathetic nature of Gatsby's waiting helps set the tone for the end of the chapter, leaving little doubt with the reader that Daisy will never leave Tom. The desperation in Gatsby's voice and actions gives the reader another moment to root for him but only because he is the underdog who is destined to fail.