Gatsby found out that Daisy had married Tom while he was at Oxford when he returned to the United States and learned about it through mutual acquaintances who shared the news with him. He had been in love with Daisy since before she married Tom, and was devastated to discover that she had married someone else in his absence.
The Buchanan's are Jay Gatsby's neighbors. Daisy Buchanan had fallen in love and promised to wait for Gatsby while he was at war. However instead of waiting she married the wealthy Tom Buchanan.
After Gatsby's death, Tom and Daisy leave town to avoid any connections to the tragedy. They continue their privileged lifestyle, seemingly unaffected by the events surrounding Gatsby. Daisy stays married to Tom despite her past with Gatsby, while Tom continues his careless and entitled ways.
Daisy does very little in The Great Gatsby. She is shown to be defined and manipulated by the men which surround her. Daisy is married to Tom, they are wealthy and represent old money within the book. Daisy has a child which is treated as a possession and used in the novel as a conversation starter. Daisy is torn between her husband, Tom, and Gatsby. Before her marriage, she was loved by Gatsby, whom she pledged to wait for, while Gatsby gathered a fortune so that he would be a suitable husband. However, Daisy was unable to wait for Gatsby, another example of her lack of power, and married Tom. Daisy is unable to choose between her two lovers, and instead allows herself to be dominated by Tom, who takes her away from Gatsby at the end of the novel.
Tom's having an affair and Daisy knows it, while Daisy is seeing Gatsby.
In F. Scott Fitzgerald's "The Great Gatsby", Daisy waits for Jay Gatsby briefly before she determines she would be better off with her own kind. While Jay is still going to school in England, Daisy married Tom when he returns home from the war.
The conflict between Gatsby's Daisy and Tom in "The Great Gatsby" is primarily due to their past relationship and Daisy's inability to fully commit to Gatsby. Tom represents the old-money elite that Daisy is accustomed to, while Gatsby represents new wealth and a chance at a new life. Daisy's indecision and fear of social consequences ultimately lead to her choosing Tom over Gatsby.
Gatsby believes that Daisy is trapped in an unhappy marriage with Tom and that she only truly loves him (Gatsby). He sees Tom as a careless and insensitive husband who takes Daisy for granted. Gatsby is convinced that Daisy will leave Tom for him once she realizes that their love is true and profound.
Tom cheats on Daisy with Myrtle, but he treats Myrtle poorly.
Gatsby understands the seductive power of Daisy's voice, which Nick may not fully comprehend. Gatsby associates Daisy's voice with his idealized vision of her, while Nick sees it more objectively. Gatsby's obsession with Daisy's voice reflects his intense longing for her, which Nick may not share.
Gatsby, in order for his new persona that he has created for himself to work [being an "Oxford" graduated young gentleman] feels that this is an appropriate expression to use; yet Tom confronts this later in the book, just before Myrtle is ran over.
Physical Appearances: Daisy is light skinned and blond, while Myrtle has a more swarthy complexion and dark hair. Daisy dresses mostly in white, which represents her cleanliness and purity, while Myrtle chooses vibrant colors that reflect her loud personality. Daisy is ethereal and graceful, while Myrtle is robust and brassy.Upbringing/Class and Personality: Daisy has been raised in privilege, while Myrtle has had to claw and scratch for everything she has. Daisy considers her wealth her "due", while Myrtle's increase in status (through Tom) is fairly recent. Daisy is "old money," and therefore comes from "good breeding." Myrtle, much like Gatsby, is considered an upstart with no business hanging around with New York's elite. People with "class" shouldn't (gasp) EARN their money. People of class either inherit their cash or marry into it.
Nick Knows Daisy and Tom because Nick is Daisy cousin while Tom is her Husband