The friend you speak to most is not always the one you would call

What follows is the working version of depth versus contact frequency: the decisions in the order you actually meet them, with the reasoning attached.

Two things that look like one thing

Frequency measures how often somebody appears in your week, and depth measures how much of yourself you are willing to hand over to them. They correlate loosely, which is why people assume the friend they message every day is automatically the friend they would ring at midnight.

Plenty of high-frequency friendships run entirely on shared circumstance, humour and news, with no history of either person having needed the other. Plenty of low-frequency friendships have been tested once, decades ago, and have never lost the credit that test established. Neither type is superior; the error is only in mistaking one for the other when it matters.

How convenience friendships work

A convenience friendship is built on a shared setting, a school gate, a team, an office floor, and it is often genuinely warm. It supplies daily company, practical help and the running commentary that makes an ordinary week bearable, all of which are real goods. What it may not have supplied is any occasion on which either person was in trouble and had to ask.

Without such an occasion neither of you knows how the friendship behaves under load, and assuming it will hold is a guess rather than knowledge. That guess is often correct, but it should be recognised as a guess rather than as an established fact.

How tested friendships behave

A friendship that has survived somebody's genuinely bad year carries a different kind of credit, and that credit decays remarkably slowly. Two people who have seen each other at their worst have already done the awkward part, so a request years later costs less to make.

This is why people sometimes ring an old friend they barely see rather than the person they had lunch with yesterday. It is not disloyalty to the closer-by friend; it is an accurate reading of who has already demonstrated the relevant capacity. The tested friendship may need almost no maintenance to remain available, which is a genuine and slightly unfair feature of how these things work.

Doing the audit honestly

Write down who you have spoken to most in the last fortnight, then separately write down who you would tell if something went badly wrong. For most people the two lists overlap by less than half, and the discrepancy is worth sitting with rather than correcting immediately. Ask of each name what you have actually given them, because friendships you receive from but never contribute to are the least reliable in a crisis.

Notice any name on the second list you have not contacted in a year, since availability that is never exercised eventually stops being real.

The audit is not a scoring exercise; it is a check on whether your assumptions match your evidence.

When the mismatch causes damage

People sometimes bring a serious problem to a convenience friend who is not equipped for it, and then read the awkward response as a betrayal. The friend has not failed; they have been asked for something the friendship never established it could carry.

The reverse happens too, when somebody withholds a real difficulty from a close friend simply because they see them less often. Both errors are avoidable by knowing in advance roughly what each friendship is for, without ever having to say so out loud. If a problem is genuinely beyond what any friend can hold, a counsellor or a support line is the right destination rather than the fifth friend on the list.

Moving a friendship from one column to the other

Depth is not produced by time served; it is produced by disclosure that is met well, which requires somebody going slightly first. Start small, with something mildly unflattering rather than something enormous, and see what the other person does with it.

At the kitchen table, a friend who matches your disclosure, keeps it and does not use it later has just shown you something important. A friend who redirects it to themselves or treats it lightly is not a bad person, and the answer is simply to stop escalating. This process takes months rather than an evening, and it cannot be forced by manufacturing an intense conversation.

The takeaway

Know which of your friendships have been tested, because a crisis is a bad moment to be finding out.

The apology that works is specific, unhurried and free of the word but.