" Do we always fret about our partners’ exes? he wonders. And do we extend that to everyone they knew before they met us? Is it their whole past we’re jealous of, as though we want them to be born again when we walk into their lives? It’s a depressing thought. He has believed himself to be bigger than that, and a whole lot more rational. "

― M.R. Carey , The Boy on the Bridge (The Girl With All the Gifts, #2)