Affairs & Smartphones
The way affairs start has changed. The phone in your pocket is a big reason why. Here’s a look at some of the research about this.
Something happened to affairs around the time everyone got a smartphone.
It didn't happen all at once. It was a gradual reshaping of how temptation works, how it presents itself, and how easy it became to rationalize what was happening until it was too late to pretend otherwise. Researchers have been tracking it for years, and what they've found is worth paying attention to, whether you're trying to understand how you got here or trying to make sure you never do.
Start with this: a 2017 study published in Computers in Human Behavior by researchers McDaniel, Drouin, and Cravens examined married and cohabiting couples and found a clear, consistent link between infidelity-related behaviors on social media (secret messaging, reconnecting with ex-partners, forming emotional connections outside the relationship) and lower marital satisfaction. What made the findings interesting wasn't just that the behaviors existed. It was the pattern that surrounded them: the hiding, the defensiveness, the discomfort at the thought of a partner reading those messages.
That discomfort is worth paying attention to. Most people who find themselves in that situation don't describe it as cheating. Not at first. It feels like something less significant: a conversation, a connection, something that doesn't count yet.
Research on online affairs, including a study from the Open University, found that what one partner might experience as casual chatting can be deeply hurtful and disloyal to the other. That gap between what one person considers innocent and what the other would call a betrayal sits at the center of much of the pain I see in some couples. It’s not because someone is overreacting, but because the rules were never discussed, so phone use could easily slip into the “what’s the big deal?” category.
The "why" behind affairs has also gotten more research attention than it used to. A widely-cited study from the University of Maryland, published in the Journal of Sex Research, surveyed more than 500 people who had been unfaithful and identified eight distinct motivations: anger, low self-esteem, lack of love, low commitment, desire for variety, feeling neglected, sexual desire, and situational opportunity. Sexual desire, by the way, came in last. Feeling neglected and situational opportunities were near the top.
That last one matters in the digital conversation. Opportunity used to require proximity. It required sustained time with another person, which created repeated chances to drift. The phone eliminated that requirement. Now opportunity is abundant—it's the old connection that resurfaces on social media, the work contact that starts texting outside of hours, the slow escalation of a conversation that was technically always appropriate until it wasn't, the unexpected message from a past relationship.
The same University of Maryland research found that situational factors—being in the wrong place, at the wrong moment, without the guardrails that would normally apply—were a significant driver, particularly for men. That doesn't excuse anything, but it does suggest that the conditions matter (even for people with “good character”) and that couples who never talk about digital boundaries are quietly leaving many conditions unaddressed.
What the research keeps circling back to is something that every couple in crisis eventually has to reckon with: digital life has made it easier than ever to drift, and harder than ever to notice you're doing it. The phone doesn't create the vulnerability. It finds it.
That's not a reason to live in fear of your partner's screen. It's a reason to have the conversations most couples avoid—about what connection outside the relationship looks like, about what crosses a line, about whether the two of you even agree on where that line is. Those aren't comfortable conversations. They're also not optional, not anymore.
The affairs that blindside people most completely are rarely the ones that started with intention. They're the ones that started with a message that felt, at the time, like nothing.
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