Most people judge a relationship by how comfortable it feels. If there isn’t much conflict and both partners feel reassured, it seems fair to assume things are going well.

Comfort matters, but it isn’t the most reliable measure of health. Some relationships feel calm because both people are quietly working to keep them that way. They hold back things that might sting, and they steer around anything that feels tense. That kind of calm takes effort, and it tends to give way when real stress arrives.

A more telling question is how a relationship handles discomfort when it shows up . What sets strong couples apart is that hard moments don’t feel like a threat to the relationship itself. Two signs of this stand out, and both can seem counterintuitive.

Sign 1: You’d Rather Hear An Uncomfortable Truth Than A Comforting Lie

Imagine driving home after dinner with friends, and one partner asks, “Did I come across badly tonight?” The easy answer is “No, you were fine.” The honest answer might be “You cut Sam off a few times, and I think he noticed.”

Most people would call the first answer kind. Psychologists call it a prosocial lie, meaning a lie told to protect someone else’s feelings rather than the liar’s own interests. They’re usually seen as harmless, and in small doses they often are.

But a 2025 study published in The Journal of Social Psychology found an interesting pattern in who actually wants to hear them. People who were less satisfied in their relationships were more likely to prefer being lied to, and they were also more likely to see plain honesty as harmful. People in happier relationships had less interest in being shielded, even by well-meant lies.

One way to understand this is through what psychologists call positive illusions. These are the slightly generous views partners hold of each other and of the relationship. According to a 2019 review published in Frontiers in Human Neuroscience , a little of this is healthy, because it helps people give each other the benefit of the doubt. When a relationship feels uncertain, though, people start leaning on those illusions more heavily. A comforting lie protects the picture they need to keep believing, and the truth starts to feel risky.

In a secure relationship, the honest answer about Sam lands differently. It’s a little embarrassing, and it’s useful, and it says nothing about whether the relationship is in trouble. One framework, the Theory of Resilience and Relational Load, offers a useful explanation. Everyday supportive exchanges build up emotional reserves between partners, and those reserves let a couple absorb difficult information without feeling shaken by it.

There is also a smaller cost to white lies that tends to go unnoticed. When reassurance comes automatically, it gradually loses its value. A person whose partner always says “you were fine” can never be fully sure when it’s true. Partners who are honest about the small things make their reassurance believable, so that when they say “you did great,” it actually means something.

This isn’t an argument for bluntness without care. The healthiest partners are honest and still pay attention to timing and tone. They simply don’t treat each other as too fragile to hear the truth.

Sign 2: They Can Let Each Other Have A Bad Day

Picture a partner coming home quiet after a hard meeting. In one version of the evening, the other person asks what’s wrong, then asks again an hour later. They start to wonder whether they did something, and by 9 p.m. the two of them are arguing about the dishes, even though nobody was upset about the dishes.

In another version, the other person notices the mood and says, “Rough day? I’m around if you want to talk.” Then they get on with their evening. The quiet partner has room to decompress, and the mood usually passes on its own.

The second response can look a little detached, but it reflects something psychologists consider a hallmark of emotional maturity . In Bowen family systems theory, it’s called differentiation of self. The idea is that a person can stay close to someone while still keeping their own emotional footing, so that a partner’s distress doesn’t automatically become their own.

When differentiation is low, moods tend to spread through the relationship. A 2021 study published in New Media & Society , which followed couples day to day, found that one partner’s stressful day can show up in the other’s mood and lead to more arguments between them. Both people end up reacting to the tension rather than to whatever actually happened. Over time, each partner can start to feel responsible for keeping the other stable, which is a tiring role to carry every day.

Some people find this hard because they grew up in homes where a parent’s bad mood meant something was about to go wrong, so they learned to notice shifts quickly and fix them fast. That habit made sense then. In an adult relationship, it can mean treating an ordinary bad day as an emergency.

Research consistently links higher differentiation with greater relationship satisfaction, including a 2022 study published in PLOS ONE . It follows that partners who can let a mood pass without taking it personally are likely to fight less about things that were never the real issue. A partner who doesn’t have to act cheerful to keep the peace is a partner who can relax at home.

Both of these signs come from the same kind of trust. In a healthy adult relationship, people don’t need to be protected from the truth or from each other’s harder days, because the relationship is steady enough to handle both.

Do you keep the peace by smoothing things over, even when the truth would help more? Find out how much you avoid hard conversations with this science-inspired test: Conflict Avoidance Test