Most couples like to think of their relationship as an open book. Ask anyone in a long term partnership what they value most, and honesty usually tops the list. Yet beneath the surface, plenty of ordinary behaviors quietly shape how couples actually treat each other, and few people bring them up first.
These habits rarely make it into date night conversations or anniversary toasts. They show up instead in small, private moments: a phone checked when a partner is in the shower, a grudge nursed a little too long, a silence held on purpose. Researchers have spent years studying exactly these patterns, and the findings are more common, and more revealing, than most people expect.
Going quiet as a form of control
Going quiet as a form of control (Image Credits: Pexels)
The silent treatment feels almost harmless in the moment, a way to cool off rather than say something regrettable. Psychologists describe it differently. Sulking, sarcastic comments, or outright silent treatment fall under what psychologists call indirect opposition, and research suggests it is just as common in romantic relationships as direct confrontation. The twist is what it actually accomplishes.
Studies suggest going silent functions as a way to test a partner's degree of commitment to the relationship, rather than simply a cooling off period. That said, it rarely produces the outcome people hope for. Research indicates it doesn't actually work to change the other person's behavior, and it makes them less happy with the relationship. A 2026 systematic review reinforced this, noting decreased overall psychological health with long-term emotional distress and poor relationship satisfaction for both givers and receivers of the silent treatment.
Checking a partner's phone when no one is looking
Checking a partner's phone when no one is looking (Image Credits: Pexels)
Phone snooping sits in an uncomfortable gray zone. Most people would call it a betrayal if it happened to them, yet plenty admit to doing it themselves. In a sample of 4,860 U.S. adults, Pew Research Center found that 34 percent admitted to looking through their current partner's cell phone without their knowledge.
Among younger adults the numbers climb even higher. A 2012 study by Derby, Knox and Easterling found that about two thirds of participants admitted to surreptitiously looking through a partner's private messages, including social networking sites and texts. The behavior does not come without cost. Research on outcomes after discovery found that when the relationship ended following snooping, it was "either because the phone owner felt their trust was betrayed, or the relationship was also experiencing difficulties."
Hiding small purchases and everyday habits
Hiding small purchases and everyday habits (Image Credits: Unsplash)
Not every secret is dramatic. A surprising amount of hidden behavior in relationships involves things most people would consider trivial, like an extra snack or an impulse buy. When the action is both common and mundane, such as eating a candy bar on the way home from work or hiding a package delivered to the house, about nine in ten people admit to engaging in such secret behavior.
What's interesting is that this small scale secrecy is not necessarily corrosive. Research finds that secret consumer behavior can actually have a positive effect on relationships, since people invest more in them out of guilt. A separate survey of cohabiting couples found similar patterns on a larger scale. Fifty two percent believe their partner is still hiding something, with the most common secrets including details about past relationships, doing something they know their partner would be upset about, and undisclosed spending habits.
Keeping a mental scorecard of who does more
Keeping a mental scorecard of who does more (Image Credits: Unsplash)
Few habits sound as reasonable, and quietly cause as much damage, as keeping score. It usually starts innocently, a way of tracking fairness in chores or effort. Psychologists studying couples describe this as an exchange orientation, and when partners focus on keeping score, they create an atmosphere of tension, because scorekeeping is inherently transactional.
Part of the problem is that everyone tends to overestimate their own contribution. A classic study on this bias found that nearly 75 percent of married couples overestimated their contribution to the relationship when asked about everyday tasks like cooking or decision making. Clinicians who work with couples on this exact issue note that the habit erodes something deeper than fairness. Scorekeeping may seem like a way to ensure fairness, but it's a toxic habit that erodes trust, breeds resentment and harms intimacy.
Choosing the phone over the person in the room
Choosing the phone over the person in the room (Image Credits: Pexels)
Anyone who has been mid-conversation while a partner glances at a buzzing phone knows the feeling. Researchers have a specific term for this now. Increasing smartphone use has led to the practice of phubbing, a combination of the words phone and snubbing, referring to ignoring a person in your company while looking at a phone.
The behavior tends to sneak in gradually rather than arrive as a single decision. Many people report glancing at smartphones when talking to a partner, checking their phone during a lull in conversation, or using their phone while out together. No one plans to make their partner feel secondary to a screen, yet the pattern is common enough that researchers study it as a distinct relational habit rather than a minor quirk of modern life.
Final thoughts
Final thoughts (Image Credits: Pexels)
None of these five habits are rare or particularly shocking on their own. What stands out is how ordinary they are, and how rarely couples talk about them directly. The silent treatment, the occasional scroll through a partner's messages, small hidden purchases, quiet scorekeeping, and phubbing all share one thing in common: they tend to operate best in silence, and lose most of their power the moment they're named out loud.
Recognizing a habit is not the same as fixing it overnight, but it does shift something. Once a pattern has a name, it becomes harder to pretend it isn't there.