"Burke was... he took something from me. He took little pieces of me - little pieces over time, so small I didn't even notice, you know He wanted me to be something I wasn't, and I made myself into what he wanted. One day I was me, Cristina Yang, and then suddenly I was lying for him, and jeopardizing my career, and agreeing to be married and wearing a ring, and being a bride. Until I was standing there in a wedding dress with no eyebrows, and I wasn't Cristina Yang anymore. And even then, I would've married him. I would have. I lost myself for a long time, and now that I'm finally me again, I can't. I love you. I love you more than I loved Burke. I love you. And that scares the crap out of me, because when you asked me to ignore Teddy's page, you took a piece of me, and I let you. And that will never happen again."
Dr. Cristina Yang in Grey’s Anatomy