Gillian Flynn said this quote

I feel like Amy wanted people to believe she really was perfect. And as we got to be friends, I got to know her. And she wasn't perfect. You know? She was brilliant and charming and all that, but she was also controlling and OCD and a drama queen and a bit of a liar. Which was fine by me. It just wasn't fine by her. She got rid of me because I knew she wasn't perfect.