There’s a strange moment that can happen at a party or the office Christmas gathering. You’re there with the love of your life, and some guy starts talking to her. Although nothing he’s doing seems too out of the ordinary, something about the interaction feels a little too enthusiastic, and before long, you’re wondering whether you’re witnessing harmless chit-chat or watching someone make a move.
That instinct isn’t meaningless, but it also isn’t proof. Research suggests that people are actually way worse at identifying flirting, especially when the signals are subtle. Rather than deciding that every smile means trouble, it makes more sense to watch for several behaviors that consistently point in the same direction.
Watch Where His Attention Keeps Going
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The first clue is often disproportionate attention. If several people are talking but one man continually directs his questions, jokes, eye contact, and reactions toward your wife, it could be because he’s trying to cozy up to her. On the other hand, someone who's simply sociable on his own tends to spread that energy around.
Eye contact alone doesn't settle anything, either—people naturally look at someone who's speaking. That being said, a large research review involving 5,422 participants found that attraction was associated with behaviors including eye contact, smiling, laughter, mimicry, physical proximity, and initiating conversation. So, it’s more about the sum of a man’s parts. The more of those items he ticks off, the more meaningful the pattern becomes.
Notice When Friendly Starts Feeling Personal
Compliments offer another useful distinction. Telling your wife that her presentation was excellent or that she chose a great restaurant is par for the course behavior; repeatedly praising her lands differently. The trick is to sniff out the context. It matters more than you think.
Physical contact can make things clearer, too, although this also depends on personality and culture. Keep in mind that a friendly hug between friends isn’t suddenly scandalous because someone’s married (that’s also a pretty outdated way of seeing the world). But unnecessary touches to the arm, lower back, hand, or shoulder may deserve more attention when they're coupled with sustained eye contact and focused conversation. Again, you're looking for a combination.
Listen to the questions, too. Someone moving beyond ordinary conversation can actually get pretty brazen. They may start asking whether your wife’s happy, what she does when you're not around, whether the two of you spend much time together, or what qualities she finds attractive.
The Biggest Clue is Whether He Tests the Boundary
Flirting also involves testing whether the other person will reciprocate. That could mean making a suggestive joke or creating an opening for private conversation and then watching how she responds. If the behavior becomes progressively more personal whenever it's received warmly, you're likely witnessing someone trying to make a move.
Perhaps the biggest red flag, however, is when another guy goes out of his way to exclude you. It’s not enough to only acknowledge you briefly or shake your hand; it’s just good social form to welcome people into the conversation. Someone who respects your marriage doesn't have to become your best friend, but acting as though you’ve inconveniently disappeared can stand out.
Don’t forget that digital behavior can also remove some of the ambiguity. An acquaintance who suddenly slides into your wife’s DMs may be trying to move the relationship into different territory. Should that happen, the most important thing both of you can do is talk about it; even if one person doesn’t think it’s an issue, that doesn’t mean their spouse will agree. In fact, the Gottman Institute notes that hidden friendships and repeatedly crossed boundaries can become damaging even when a relationship hasn't become physically unfaithful.
Don't Turn Suspicion Into an Interrogation
Even when someone clearly wants your wife, there's an important distinction: another person's behavior isn't your wife's. She might notice the flirting and ignore it, shut it down, or find it mildly amusing. In some cases, she might not even know what’s going on. Treating her like she's responsible for every man who develops a crush is a quick way to turn their questionable behavior into an argument—and for no reason.
If something’s bothering you, describe what you actually saw so you two can chat about it. If anything, discussing jealousy instead of hurling accusations keeps your bond much stronger. It also shows that she’s not under fire for something someone else did.
Ultimately, flirting is easiest to recognize as a pattern: concentrated attention, efforts to stay close, unnecessary touching, private contact, and repeated attempts to test boundaries. One signal can mean almost anything, but several give you more information. Trust what you notice, but leave enough room for context. Protecting a good marriage demands awareness without turning every charming stranger into a suspect.
