Mildred betrays Montag because she feels it is the correct thing to do as a product of the culture in which they live and that his association with books is wrong. He displays the books to her. When her friends come to visit, he performs a poem to them. Montag endangers her present life as well as the television in their house. When he re-sets the television during one of his broadcasts, Mildred realizes that he is trying to destroy it and therefore herself.
Mildred's betrayal of her husband is what causes him to be punished by being turned into a fireman. By betraying him, she has betrayed everything good about her marriage and her society. She has shown that they are nothing but objects to be used by others for their own purposes.
As soon as she learns that her friends want to burn down their house, she runs away from them. Even though it means being chased by the firemen, she doesn't stop going until she reaches the city center. There she finds another man's body lying in the street. The police think that he was murdered but Mildred knows that he was only taking a nap after a hard day's work. She stays with him for a while before continuing her journey home. This shows that she has lost respect for her husband when she thinks more about his needs than hers.
When Montag kills a fireman who was chasing him, Mildred burns with rage. She wants revenge on him for what he has done to their family.
"Books aren't people," Mildred says to Montag as he tries to read. She simply does not "get it." Mildred wants Montag to stop and return things to the way they were before she discovered there were books in her house.
Mildred is referring to the fact that books are objects and, thus, don't have feelings or thoughts of their own. They can tell stories about people who feel pain and joy just like everyone else, but they're completely different from people in many ways. For example, books cannot walk out the door or say no to someone who wants to borrow them.
Mildred also doesn't understand why Montag keeps reading even though he knows what will happen next. He keeps reading because it's all he has left of his wife. Without her, life is meaningless.
In conclusion, Mildred believes that books are useless and should be burned like they were in 1950s America. However, this act of destruction would destroy everything Montag has left of his wife so it's not very wise. Instead, he decides to stop reading at night so he can have some time alone with her memory.
She didn't want to cope with Montag's possession of the books. What do you believe prompted Mildred to destroy her own home by saying that her husband had concealed books? Beatty intends to shake Montag to his core by accusing Mildred and his neighbors of betraying him. He wants them to see how much he knows about their lives and he is going to use this information to intimidate them.
Mildred fears that if she does not destroy everything related to Montag's book burning, then he will know that someone betrayed him. She believes that by destroying her home, she can make him feel insignificant enough so that he will forget about the books and his obsession with them.
When Montag comes upon Mildred's destruction, he assumes that she has left him. However, when Beatty tells Montag that Mildred has abandoned him, this causes Montag to realize that someone else knew about the books he burned. This person must have been very important to Mildred for her to leave like this after all they had shared together. It makes sense that it would be Beatty who tells Montag that she has gone because this man knows about the books that matter to Montag the most. He needs to scare Montag into believing that everyone around him is against him before telling him that someone betrayed him.
Montag decides to burn down Beatty's house as revenge for this act of betrayal.