Why does Mildred need help when Montag gets home in the Fahrenheit 451?

Because he's trying so hard to reach out for her, he knows that the 3 TVS parlor in his living room and seashells in her ears are standing between them like a wall, he knows he's unhappy and even perhaps out of love and he's trying to figure out answers to all these unrequited worries and questions and doubts... he asks her where they first met and she says she doesn't remember and that it doesn't matter. At the end of the book, Montag remembers that the 2 met at Chicago 10 years earlier. Hope this helped! :)