Mildred didn't want their house to be burnt down since if you have a book, your house would have to be burnt down.
Answer:
He does truly love Mildred, but she does not truly love him. He questions whether or not she remembers how they met and she does not recall it. She is also very careless when it comes to Montags well-being to the point where she eventually ends up turning him in for the stolen books and killing herself.
Explanation: