One of the most common phrases in couple therapy sounds reasonable on the surface. “I do this because you do that.” “I react like this because of how you treat me.” “I get angry because you ignore me.” “I ignore you because you get angry.” It presents itself as a simple cause-and-effect explanation. A leads to B. In other words, it becomes your fault. If you stopped doing this, we would be fine.

This is not a denial that behaviour has impact. What we say and do affects the other person. The issue is not impact, but the logic used to explain what is happening, and the narrative it creates over time.

What is essentially circular becomes reduced to a straight line.

In systemic thinking, behaviour exists within a loop rather than a chain. Each action is both a response to what has already happened and a stimulus for what comes next (Bateson, 1972; Watzlawick, Weakland, & Fisch, 1974). Over time, this looping process stabilises into a pattern that sustains itself.

This does not make history irrelevant. There is often a legacy of injury, things said and not said, done and not done, that carries weight in the present and needs attention. But when the organising explanation becomes linear, something fundamental is lost. One partner is positioned as the cause, the other as the justified reactor. The problem is located inside a person rather than in the pattern between them.

Attention moves toward correcting an individual rather than changing the interaction. Accountability becomes one-directional. The reciprocal nature of the pattern disappears, even though both partners continue to participate in maintaining it.

With that framing comes an implicit logic. You move first. I will change when you change. Change becomes conditional and sequential, and this logic is usually present from the beginning, embedded in how the complaint is described.

When therapy adopts that same frame, it reinforces the linear thinking that keeps the couple stuck. If one partner waits for the other to change first, nothing changes.

Relational intervention requires something more demanding. Both partners are required to alter their participation at the same time. Not because their contributions are identical, but because the pattern is co-maintained. Each person’s behaviour continues to make sense within the loop, and it is the loop that needs to shift.

When both partners change, even slightly, the interaction begins to feel different. The sequence no longer unfolds in the same way. Once that shift occurs, the legacy of injury can be addressed without immediately reactivating the same pattern.

Circularity is not abstract theory. It is a discipline of thinking that resists simple causality and refuses to organise the interaction around blame. In couple therapy, it is often the difference between analysing what went wrong and changing how the relationship actually works.