yes, she knows and that's why at the end of the novel she will like the concept of having an affair with gatsby ,and also because she likes to be superficial and shallow
She tells him that Tom is cheating on Daisy with another woman.
tom is a slease. he is cheating on Daisy with Myrtle but abuses Myrtle for talking bad about Daisy. Myrtle is nothing to tom but his personal mistress. shed do anything he asks and anything for him.
Both are unhappy and cheating!
Nick Knows Daisy and Tom because Nick is Daisy cousin while Tom is her Husband
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 breaks Myrtle's nose because she taunts him about Daisy, his wife, and ridicules him for not leaving Daisy. Tom's anger and frustration about his situation with Daisy boil over, leading him to lash out physically against Myrtle in a display of dominance.
The narrator, Nick Carraway, is Daisy's cousin.
Jordan Baker told Nick that "Tom's got some woman in New York".
Nick knows Tom and Daisy in the Great Gatsby because Nick is Daisy's cousin.
Nick may not tell Daisy about Tom's infidelity because he believes it is not his place to interfere in their marriage. He values loyalty and discretion and may not want to get involved in their personal issues. Additionally, Nick may feel that it is ultimately up to Daisy to decide what she wants to do with the information.
It's ironic that Tom is angry at Daisy for loving Gatsby because Tom himself is having an affair.
Nick observes a tense conversation between Tom and Daisy in the kitchen, where Tom is openly flirting with another woman in front of Daisy. Daisy seems uncomfortable and unhappy, but doesn't confront Tom about his behavior. This scene highlights the strained relationship between Tom and Daisy, and hints at Tom's disrespect for Daisy.