Montag becomes stuck on the concept of how meaningless his marriage is. He knows little of anything about mildred, his wife. All they seem to do is occupy space the other leaves vacant. Montag stole a book referred to it as poison, as he gripped it in his hand. He began to cry when thinking about the book, and then thought of how terrible it was that he wouldn't of cried of Mildred died.  He had been trying to think of where he had met Mildred, but couldn't quite put a finger on it. when he was crying and Mildred asked him what was the matter, his rebuttal was the same question he kept failing to answer in his head, "where did we first meet?". Mildred laughed when she couldn't figure it out. she then said that it didn't matter much anyways, took a shower, and began  popping pills like they were candy and she some sort of disorder which would cause someone to eat a lot of candy. (great analogy, i know.) Romantic relationships are based on the idea of love, and each other being the key to happiness. Mildred and Montag have close to a negative effect on each other, and Montag is finally starting to realize that nothing he has with her is real. this upsets and frightens him, since he's beginning to uncover this larger picture of nothing in the world he lives in is real, its all just an abstract disarray of lies, sleeping pills, and unquestioned government power, all stuffed into one melancholy world.