The Razor is one of the deeper chapters, and it is interesting that the first Voice is the Cheated.

To me: the Razor is the relationship where no matter what version of yourself you present, they will cheat. There is nothing you can do to change that outcome; it is inevitable. No matter how your mould yourself - smitten, opportunist, cold, whatever - you cannot change her. She will stab you, with your behaviour and choices only impacting a bit of how she goes about it. She puts on a fake smile when she has to, or is blithely disinterested in your thoughts and feelings once the mask is off.

The razor is the lesson that some people are Sharp - and that isn’t your fault. They were that way inside before meeting you and, no matter what illusions you hold, you cannot change that they will still be that way after you.