Caitlin goes to walk her dog on the Heath and has a revelation about the relationship she has been trying so hard to make work:
"The people around you are mirrors, I think to myself. The dog is paddling in the lake. I watch her lap at the water.
You see yourself reflected in their eyes. If the mirror is true, and smooth, you see your true self. That's how you learn who you are. And you might be a different person to different people, but it's all feedback that you need, in order to know yourself.
But if the mirror is broken, or cracked, or warped, I continue, taking another drag, the reflection is not true. And you start to believe you are this...bad reflection."