When we were together before, the world was small to us, but as you grew bigger to life and the world became desirous to living, we became smaller to each other.
The more energy taken, the less energy that is left for us to implement our goals and the smaller the probability of realization of our innate potential
When you're depressed you retreat and you go into a smaller world. This is why Brighton worked well for the story, because it's a smaller world than London.
How much larger your life would be if your self could become smaller in it.