Starting again, with what you know now

Anyone entering a new relationship after a previous one has more information than they had the first time. It is worth setting out what that information reliably consists of.

What is well supported

Contempt is the thing to avoid. The most consistent finding in the observational literature, and the one behaviour that appears to do disproportionate damage.

The everyday balance matters more than the arguments. The ratio of ordinary warmth to ordinary friction predicts more than the conduct of any individual conflict.

Responding to small approaches. The unglamorous business of answering when someone remarks on something out of the window.

Complaining about behaviour rather than character, and doing it early enough that it is one instance rather than a pattern.

Repair, offered and accepted. The acceptance matters as much as the offer.

Shared novel activity, which has experimental support and is more effective than the equivalent time spent on familiar pleasant activity.

Explicit decisions rather than drift at each major transition.

What is not well supported

Worth knowing in order to ignore it.

That compatibility can be assessed in advance from characteristics. The prediction research is poor.

That any personality typology matches people usefully.

That there is a correct timeline for anything, including sex, cohabitation or commitment.

That intensity in the early phase indicates anything about durability.

That people have a single dominant mode of expressing affection.

That the presence of conflict is a bad sign, or its absence a good one.

What to do differently

Say things earlier. The single most common regret, and the easiest to act on.

Intentions, requests, complaints and limits, stated while they are small.

Watch behaviour under cost. How someone treats people who cannot help them, how they handle being wrong, what they do when inconvenienced.

These are the informative signals and they are only visible over months.

Keep your own life. Friendships, activities, money, opinions.

This appears throughout: as protection against isolation, as material for the relationship, and as the thing that determines whether leaving is possible if it becomes necessary.

Take the pattern seriously. Both theirs and yours.

Do not decide anything major in the first year. Judgement about a partner is documented as impaired during that period, in a benign and specific way.

The thing that is genuinely different this time

Not wisdom exactly.

What people entering a second serious relationship generally have is a working knowledge of what an unsatisfactory arrangement feels like from inside.

That is the thing the first time around does not supply, and it is more useful than any framework, because it makes the signal recognisable early rather than after several years.

What it is worth guarding against is the overcorrection — treating a new person as a suspect on the basis of a previous one's conduct, which produces its own failure.

The realistic expectation

Set out plainly.

A good relationship contains difficult periods, unresolved disagreements that recur for decades, and stretches where neither person is enjoying it.

What distinguishes the ones that work is not the absence of those things but what surrounds them: whether the ordinary days are good, whether difficulties get raised, and whether both people are still interested in what the other one thinks.

None of that requires exceptional compatibility, and all of it requires attention over a long period, which is a less appealing description and a more accurate one.

The one habit worth installing first

If only one thing from all of this is adopted, it should be this.

Say the small thing at the point it is small.

Almost every failure described across this subject traces back to something not raised: a preference not stated, an irritation absorbed, an intention not clarified, a complaint stored rather than made.

The accumulated version is what becomes contempt, drift, resentment and the argument that is never about what it is about.

Raising things early is uncomfortable, unglamorous, and available to anyone, and it prevents more of the damage than any of the more interesting material.

General information about relationships, not psychological advice. Consult a qualified professional about your own circumstances.