The Psychology of Jealousy in Love — Why It Happens
Last reviewed by the Men Women Psychology editorial team.
The evidence
What the research actually shows
Jealousy is often described as a response to a perceived threat to a relationship a person values. Some of the most cited work comes from Buss and colleagues (1992), who reported that, on average, men were somewhat more distressed by imagined sexual infidelity while women tended to be more distressed by emotional infidelity. This pattern has been replicated in several studies, but it is an average tendency with large overlap — many men report emotional infidelity as more painful, and many women the reverse.
Later research has questioned how large and how universal that sex difference really is, noting it can shrink or shift depending on how questions are asked and on the culture studied. What is more consistent is that both sexes experience jealousy strongly and that it is closely tied to how much a person feels they could lose. Mikulincer and Shaver (2007) link jealousy to the attachment system: the same circuitry that makes us seek closeness also makes us vigilant to threats against it.
Individual differences often matter more than gender. Murray, Holmes and Collins (2006), in their risk-regulation model, describe how people who doubt their own worth or their partner's regard tend to scan for signs of rejection. For them, an ambiguous text or a friendly glance can register as evidence of danger, whereas a person who feels secure may barely notice the same cue.
The mechanism
Why this happens
At its root, jealousy appears to be a protective emotion. Mikulincer and Shaver (2007) frame romantic bonds as attachment relationships, and attachment systems are built to detect threats to a needed connection. From that angle, a flash of jealousy is the alarm going off — the mind flagging that a source of security might be at risk. The emotion itself is not pathological; what matters is what we do with it.
Attachment style shapes how loud and how frequent the alarm is. People higher in attachment anxiety tend to feel jealousy more readily and ruminate on it longer, while those higher in avoidance may suppress it or respond by withdrawing. Murray and colleagues (2006) add that low self-worth amplifies the signal: when someone fears they are not enough, they more easily interpret neutral events as threats.
Buss and colleagues (1992) offer an evolutionary reading of the average sex differences, arguing that ancestral pressures may have tuned men and women to slightly different cues of threat. Whatever the origins, this is best read as a small statistical tilt layered on top of a shared human capacity, not as two fundamentally different emotional systems.
In practice
What this looks like in real life
One partner feels a jolt of unease when the other laughs warmly with a coworker. For a secure person this may pass in seconds; for someone carrying old fears of abandonment, the same moment can spark hours of replaying and worry — illustrating how much the inner sense of security shapes the reaction.
A person who suspects they are 'less than' their partner's exes or friends may seek reassurance again and again. The reassurance soothes briefly, then the doubt returns, creating a loop that can wear down both people even when no real threat exists.
Jealousy can also surface as quiet withdrawal rather than open accusation. Someone who feels threatened but cannot say so may go cool and distant, leaving a partner confused about what changed — a pattern more common among those who tend to avoid emotional confrontation.
Myth vs. evidence
What most people get wrong about this
A common misconception is that jealousy proves love, or conversely that any jealousy is a red flag. Research suggests the truth is in between: an occasional pang can reflect genuine investment, but persistent jealousy expressed through monitoring, accusations, or control tends to predict lower trust and satisfaction rather than deeper love.
Another error is treating the men-versus-women infidelity findings as fixed laws. The Buss-style sex difference is a modest average that varies by method and culture, with heavy overlap between the sexes — it should never be read as 'men only care about X' or 'women only care about Y.'
Why it matters
What this means for relationships
What seems to matter most is the gap between feeling jealousy and acting on it. Naming the feeling honestly — 'I felt insecure when that happened' — tends to invite closeness, whereas surveillance, testing, or punishing a partner tends to erode the trust that makes security possible in the first place.
Because much jealousy is fueled by self-doubt, work that builds a steadier sense of one's own worth often reduces it more effectively than seeking endless reassurance from a partner. Murray and colleagues' (2006) research suggests that feeling secure in one's value lowers the tendency to read threat into ambiguous moments.
Where it varies
The nuance
The differences between men and women here are averages with substantial overlap. Hyde's gender similarities hypothesis (2005) is a useful corrective: on most emotional measures the sexes are far more alike than different, and jealousy is largely a shared human experience rather than a gendered one.
Within either gender, attachment style, self-esteem, past betrayals, and the actual trustworthiness of a partner usually predict how jealousy shows up far better than sex does. Two people of the same gender can sit at opposite ends of the spectrum.
Questions people ask about this
Is some jealousy in a relationship normal?
Most research treats occasional mild jealousy as a normal feature of attachment — a sign that a person values the bond and notices threats to it. The concern is less about feeling it and more about how it is expressed. Communicated honestly it can be fine; acted out through control, it tends to harm trust.
Do men and women get jealous about different things?
On average, some studies suggest men report more distress over sexual infidelity and women more over emotional infidelity. But this is a modest tendency with large overlap, it varies by method and culture, and many individuals show the opposite pattern. It should not be read as a hard rule.
Why am I so jealous when my partner hasn't done anything wrong?
Jealousy often tracks inner insecurity more than outer events. Research links it to attachment anxiety and low self-worth, which make ambiguous moments feel threatening. If your partner is trustworthy, the work usually involves your own sense of security rather than tighter monitoring of them.
Does jealousy mean someone loves you more?
Not reliably. A pang of jealousy can reflect investment, but intensity of jealousy is not a clean measure of depth of love. Persistent, controlling jealousy tends to signal insecurity or distrust rather than devotion, and often predicts lower relationship satisfaction over time.
How can couples handle jealousy in a healthy way?
Approaches that tend to help include naming the feeling without blaming, getting curious about the insecurity underneath it, and addressing trust directly rather than through surveillance. Building one's own steadier self-worth often matters more than seeking constant reassurance, which can become a draining loop.
When does jealousy become a problem?
Jealousy more often becomes harmful when it drives controlling behavior — checking phones, restricting friendships, repeated accusations, or testing a partner. These patterns tend to erode trust and autonomy. If jealousy is shrinking either person's freedom or peace, it has usually crossed from feeling into damaging behavior.
Research sources
These references point to the published research and established frameworks behind this page. They are provided for further reading; see our research methodology for how sources are selected.
- Buss, D. M., Larsen, R. J., Westen, D., & Semmelroth, J. (1992). Sex differences in jealousy. Psychological Science, 3(4), 251–255.
- Mikulincer, M., & Shaver, P. R. (2007). Attachment in Adulthood: Structure, Dynamics, and Change. Guilford Press.
- Murray, S. L., Holmes, J. G., & Collins, N. L. (2006). Optimizing assurance: The risk regulation system in relationships. Psychological Bulletin, 132(5), 641–666.
- Hyde, J. S. (2005). The gender similarities hypothesis. American Psychologist, 60(6), 581–592.