"OK, now we have to talk about Callie and Arizona. They have become pretty much my favorite couple, the ones I could count on. I want them to stay together, but it’s unavoidable. Callie finds her own sensitive spot in this episode. She’s vulnerable — not to the come-ons of an attractive patient — but to the sense of possibility it represents to her. And that’s something she will never get from Arizona. Because Arizona simply does not want a kid. It is, as they say, a dealbreaker. As much as I hate this break up, I have to say I love this break-up, because it feels like something many of us have been through, when we realize that the one thing you’re not getting in a relationship is just important to you as the hundred things you are getting. I’m sorry it had to happen. And if you’re as sorry as I am, I’ll just say this…keep watching! Anything can happen — and you might find yourself pleasantly surprised!"
Bill Harper (Grey Matter: From the Writers of Grey’s Anatomy)