WHATEVERWEARE · the science

The sunk-cost trap: why you can’t leave the situationship

The sunk-cost fallacy is staying because of what you’ve already put in — time, effort, hope — rather than where it’s going. Research shows invested effort makes people stay in unsatisfying relationships, which is why WHATEVERWEARE turns “months in limbo” into a penalty, not a credit.

Grounded in real research · 1 sources · updated 2026-05-30

The research

A study in Current Psychology (2016) found that prior investment — especially money and effort — made people more likely to stay in a relationship, even an unhappy one. It mirrors the “investment model”: we avoid “wasting” what we’ve sunk in.

Why long + undefined is the danger zone

A few undefined weeks is normal. But months of it is where sunk cost compounds: the more you’ve invested in someone who won’t define things, the more leaving feels like a loss — even when staying costs more.

Commitment vs sunk cost

Healthy commitment looks forward (“I believe in what we’re building”). Sunk-cost thinking looks backward (“I’ve given too much to leave”). One is about possibility; the other is about not wasting the past.

📖 The sources

FAQ

How do I know if I’m staying out of sunk cost?

Ask whether you’d start this relationship today knowing what you know. If the only reason to stay is the time already spent, that’s sunk cost talking.

So… what are you?

Run the calculator — free preview, your verdict + Wrapped for 99¢.

Calculate my situationship

Built for reflection, not diagnosis. If something here is heavy, talk to someone you trust or a professional.