Andrea and I met when we were just six years old. Both of us were two lonely girls on a playground full of strangers at a new school. Everyone had their own friend groups, and we were both pretty shy at that age. I remember the moment we met like it was yesterday. We’d both had the same idea to sit underneath the slide, but when I crawled under and into the tight space, I wasn’t expecting to see somebody already there and she wasn’t expecting anyone to come crawling in. Her green eyes...