Earlier this year, Sarah and I had a rare experience: a long car ride without the kids. It was just the two of us in the car for over four hours – with no kids shows playing in the background, no interruptions, no little ears nearby. And we spent four hours just talking about us. I don't quite remember how it started, but it became this moment-by-moment retelling of our relationship from the very start – from back in high school as we were just becoming friends. For decades she has been my favourite person in the world, my best friend, the heart of all my best memories, and you'd think there wasn't much more we could learn about our story. But maybe through complete honestly, new perspectives earned over time, and Sarah's still shockingly good memory for details, we both learned things we didn't know. When we got home, I pulled out a box of old letters and it became this archeological dig. The words I’d written, I'll admit, were shockingly juvenile at time