Heartburn by Nora Ephron

"For a long time, I didn't believe him. And then I believed him. I believed in change. I believed in metamorphosis. I believed in redemption. I believed in Mark. My marriage to him was as willful an act as I have ever committed; I married him against all evidence...I honestly believed that Mark had learned his lesson. Unfortunately, the lesson he learned wasn't the one I had in mind: what he learned was that he could do anything, and in the end there was a chance I'd take him back."