Gillian Flynn said this quote

“ Yes, I am finally a match for Amy. The other morning I woke up next to her, and I studied the back of her skull. I tried to read her thoughts. For once I didn't feel like I was staring into the sun. I'm rising to my wife's level of madness. Because I can feel her changing me again: I was a callow boy, and then a man, good and bad. Now at last I'm the hero. I am the one to root for in the never-ending war story of our marriage. It's a story I can live with. Hell, at this point, I can't imagine my story without Amy. She is my forever antagonist.We are one long frightening climax. ”