The Onion Theory of Friendship

Not all your relationships are supposed to last. Some are built to be temporary, and that's not a failure of the friendship, it is actually the design.

I first came up with this idea on our long walks in Norwich, UK, during my PhD, talking with a fellow PhD friend, Jennie Robinson. I call it the Onion Theory. It is a working theory, not a finished one. I am sharing it half-formed because I think it is worth developing further.

Picture your social world as an onion. Every layer is closer to the centre, and every layer has fewer people in it.

The Core: Your family, and the handful of lifelong friends who function like family. No maintenance required. You can disappear for a year and pick up mid-sentence. That's your roots. These people ground you.

The Keepers: The people you trust. They know things about you that could hurt you and never have. You would call them at 3am with no explanation needed. They are your loyal fews.

The Chapter: Tied to a chapter of your life: a job, a gym, a neighbourhood. Real affection, real fun, but the bond often depends on the context staying the same. Change the context, and some fade. They are like seasons, come and go.

The Peel: Acquaintances. Recognition without investment. You know a name and a fact. They are like familiar strangers.

A few things I have noticed testing this on my own life: The layers have natural caps. You cannot have 50 Inner Ring people; there is not enough time or emotional bandwidth. The Core stays smallest of all.

People move between layers constantly, in both directions. A Chapter Friend becomes The Keeper after you go through something hard together. A Core person can drift outward through neglect, not betrayal, which is often the most disorienting kind of change, because it feels like it shouldn't be allowed to happen. I consider that it is simply the natural rhythm of friendship.

And sometimes a friendship doesn't need to move inward to matter. Nietzsche has this idea of "star friendships", two people who shared real closeness, then grew apart chasing different paths, like ships leaving the same harbour for different seas. The friendship doesn't fail. It just becomes a different kind of bond; one built on shared history rather than daily presence.

Where is the edge of your onion right now? And who is quietly moved a layer this year without you noticing?