Protect expansion by resisting the slide into pure comfort
Long relationships naturally slide toward comfort and predictability — expansion requires deliberate re-injection of novelty.
Why it works
Habituation reduces the subjective salience of familiar stimuli; in relationships, this means the expansion that once happened naturally — because everything was new — must now be deliberately engineered because the partner is deeply known. The motivation does not disappear; the natural supply of novelty does. Relationships that remain satisfying long-term are those where the partners actively introduce new shared experiences rather than relying on the natural flow of events.
How to do it
- Acknowledge explicitly that novelty-maintenance is a relationship practice, not a sign that something is wrong.
- Schedule new shared experiences at a regular cadence — quarterly at minimum.
- Periodically ask each other: "Is there something you’ve wanted to try or learn that we could do together?"
- Allow the comfort of the relationship to be the foundation, not the entirety.
Evidence
Longitudinal studies on relationship satisfaction show a consistent decline over time in long-term couples; research within the self-expansion framework links this decline to reduced expansion rate rather than reduced affection, with novelty restoration producing satisfaction recovery. (observational)
Satisfaction decline is a group trend; individual couples vary enormously. The self-expansion explanation is one well-supported account among several.
Sources
- Aron et al. (2000), shared novel activities and relationship quality, JPSP
Common mistake
Treating novelty maintenance as a romantic obligation rather than a shared growth practice — framing it as a chore rather than a genuine curiosity investment reduces its effectiveness.
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More practices for Self-Expansion Model: How Relationships Grow (and Stagnate) Us
- Do novel, moderately challenging activities together
New and slightly difficult shared experiences restore the self-expansion that keeps closeness alive.
- Practise including the other person in your self-concept
Close relationships develop when you genuinely incorporate the other’s perspectives and resources into how you think — not just spend time with them.
- Pursue personal growth that you share — not parallel but joint
Growing alongside a partner or friend, rather than separately, leverages the self-expansion mechanism for both people simultaneously.
- Audit current relationships for expansion rate
Relationships that stopped expanding tend to feel stagnant — a periodic audit reveals where the growth has stopped.
- Use structured escalating self-disclosure to accelerate closeness
Closeness can be deliberately generated through mutual, gradually deepening disclosure — not just through time.
- Apply the self-expansion framework to individual growth, not only relationships
The same motivation that drives relational closeness also drives individual meaning — seeking growth for its own sake.