Nobody wants to believe it. Nobody wants to type this question into a search bar at 2am, rereading old texts and looking for signs they might have missed. But here you are — and the fact that you’re asking means you already sense something, even if you can’t name it yet.
Astrology doesn’t cause cheating. People make choices. But the natal chart reveals something real about how a person processes desire, restlessness, emotional intimacy, and commitment — and some placements make certain patterns far more likely than others. This isn’t about condemning anyone. It’s about understanding what you’re actually working with.
Before the Ranking: What “Most Likely to Cheat” Actually Means
Infidelity in astrology isn’t one thing. Some signs cheat because they’re emotionally avoidant and find it easier to start something new than to repair what’s broken. Some cheat because they need constant stimulation and mistake novelty for love. Some do it once, in a moment of weakness, and carry the guilt for years. Others create entire parallel lives with a kind of detached calm that makes it all the more devastating to discover.
The ranking below is based on patterns — the dominant emotional and relational tendencies associated with each sun sign, especially when stress, boredom, or emotional disconnection enters the picture. Your partner’s sun sign alone doesn’t determine their fidelity. Their Venus placement, their Mars, their 7th House ruler — all of these matter enormously. But sun sign patterns are real, and they’re a place to start.
The Top Three: Where Loyalty Gets Complicated
Gemini lands near the top of nearly every ranking like this, and there’s a reason that isn’t just cliché. The Gemini energy is genuinely dual — not duplicitous by design, but wired for variety, mental stimulation, and the thrill of a new conversation that feels like it’s unlocking something. When a Gemini stops feeling intellectually alive in a relationship, they don’t always leave. They look for that feeling somewhere else, often before they’ve even admitted to themselves that anything is wrong. The emotional disconnect happens quietly, and the physical follows. What makes it particularly disorienting for partners is that the Gemini often genuinely loves them at the same time. The two things coexist in a way that most other signs can’t comprehend.
Libra might be the most surprising name this high on the list, given that they’re ruled by Venus, the planet of love and beauty. But Libra’s relationship with loyalty is complicated by their deep, almost pathological need to be liked — and their equal terror of conflict. A Libra who is unhappy in a relationship will rarely confront it directly. Instead, they drift. They make themselves available to someone new while telling themselves they’re “just being friendly.” By the time they’ve emotionally checked out, they’ve often already emotionally checked in somewhere else. They don’t cheat with malice. They cheat because they don’t know how to say “I’m not happy here” without destroying everything, and the path of least resistance leads them somewhere they shouldn’t go.
Sagittarius cheats because they are, at their core, allergic to feeling trapped. This isn’t a character flaw — it’s a fundamental feature of a sign built around freedom, exploration, and the belief that life should keep expanding. When a relationship starts to feel like a ceiling rather than a horizon, the Sagittarius will find a door. Sometimes that door leads to someone else. They rarely do it with cruelty in mind. They often genuinely convince themselves that it “wasn’t serious” or “didn’t mean anything” — and they almost believe it. The hardest part for their partners is that the Sagittarius will often be the most charismatic, exciting, adventure-ready person they’ve ever been with. The connection is real. The commitment was always the question.
The Middle of the Ranking: Complicated Loyalty
Pisces is a more nuanced case than the signs above. The Pisces capacity for loyalty is enormous — when they feel genuinely seen and spiritually connected, they are among the most devoted partners in the zodiac. The danger comes from their equally enormous capacity for fantasy and emotional escapism. A Pisces who feels emotionally abandoned or misunderstood will often find a fantasy — and sometimes that fantasy has a name and a phone number. They don’t cheat out of boredom or desire for novelty. They cheat because they’re looking for the feeling of being truly understood, and they confused an emotional connection for something deeper than it was. They often feel terrible about it in ways that are entirely genuine.
Aries sits in the middle because their infidelity, when it happens, tends to be impulsive rather than premeditated. Aries lives in the moment with an intensity that can be thrilling and terrifying in equal measure. An unexpected attraction, a moment of weakness, an ego that needed feeding — Aries doesn’t construct elaborate second lives. They act on an impulse and then have to deal with the consequences, which they often do with a mixture of guilt and defensive anger. The saving grace is that Aries tends to be honest after the fact, even when that honesty is brutal. They’re not usually the slow-burn, long-term infidelity type. They’re the “it happened once and I should have walked away” type, which is its own particular kind of damage.
Aquarius is harder to read than most, because emotional detachment is so fundamental to how they operate that even their partners sometimes struggle to know where they actually stand. Aquarius doesn’t cheat out of passion. When it happens, it’s often intellectual — a deep connection with someone who understands them in a way their partner doesn’t, which gradually becomes something more. The emotional affairs Aquarius tends toward can feel, to them, entirely separate from their primary relationship, because they genuinely compartmentalize love and connection in ways other signs cannot. They often don’t see it as cheating until it already is.
Leo is often more loyal than their reputation suggests, but they have a specific vulnerability: their ego. A Leo who feels unseen, unappreciated, or taken for granted will begin to orbit toward whoever is offering the warmth and admiration they need. They’re not typically looking for variety — they’re looking for devotion, which is also what they offer. When a relationship stops making them feel like the most important person in someone’s world, they’ll find someone who does. The tragedy of Leo infidelity is that it could almost always have been prevented by simple appreciation.
The Loyal End of the Spectrum
Scorpio surprises people here. The most sexually intense sign in the zodiac — the one most associated with obsession and desire — is also one of the most loyal. That’s because for Scorpio, betrayal is the single greatest sin imaginable. They have seen enough of human darkness to know exactly what cheating does to a person, and they carry an almost sacred relationship to honesty within their intimate bonds. When a Scorpio cheats, it is almost always a sign that something has already died inside the relationship — and even then, it happens far less often than people expect. What Scorpio is far more likely to do is end things entirely before crossing that line. The sting is direct, not indirect.
Taurus is among the most faithful signs in the zodiac, and this comes from the same place as their stubbornness: an almost physical attachment to what is theirs. Taurus builds slowly, invests deeply, and does not abandon what they’ve put their energy into. They are also, not incidentally, creatures of comfort and routine — and infidelity requires a level of disruption and risk that is genuinely uncomfortable for them. When a Taurus is unhappy, they’ll withdraw, sulk, or dig in. They won’t look elsewhere. They’ll expect you to fix whatever broke, and they’ll wait a very long time for that to happen.
Cancer is perhaps the most family-oriented sign, and their sense of loyalty extends beyond just romantic partnership — it encompasses home, history, the shared life they’ve built. A Cancer who cheats is a Cancer in significant pain, because it goes against everything they fundamentally believe about what love is supposed to be. Their risk factors are different: emotional withdrawal, martyrdom, building resentments they never express. But physical infidelity is genuinely uncommon, and when it happens, it usually signals a degree of emotional brokenness that needs addressing long before the relationship can move forward.
Virgo and Capricorn round out the loyal end of the spectrum — and notably, both share the same internal logic as Taurus, even if the reasoning differs. Virgo’s loyalty comes from their internal code of ethics, which is stricter than most people realize. They will criticize, they will micromanage, they will pick apart everything that isn’t working — but they won’t cheat, because infidelity is a form of disorder that violates something deep in their nature. Capricorn is loyal because they are building something — a life, a legacy, a structure — and cheating threatens the entire architecture. Their loyalty is, in part, strategic. But it’s also genuine.
What the Ranking Doesn’t Tell You
Here’s the thing nobody wants to sit with: the most faithful sign in the world can be unfaithful to the wrong person. And the most unfaithful sign can be completely devoted when they’ve found the one who matches them at the level that actually matters — not just surface attraction, not just chemistry, but something written deeper. Astrology tells you about tendencies, about default modes, about what a person reaches for under pressure. It doesn’t tell you what they’ll choose when they’re truly aligned.
What your birth chart does reveal — and this is the part most people never look at — is who you’re cosmically compatible with at the level where loyalty becomes natural rather than effortful. The synastry between two charts can show you where friction lives, where values align, where one person’s need for freedom will always clash with another’s need for security. It can show you whether you’re choosing people whose charts set you both up for the same patterns, over and over again.
The question isn’t just whether a Gemini can be faithful. The question is whether the person you’re with — whatever their sign — is someone whose chart actually fits yours in the places that matter most. And that’s a different question entirely.
There’s a reason you keep being drawn to this type of man.
Astrology goes deeper than sun signs. Your Venus placement, your 7th House, and the planetary alignments on the day you were born already point to a very specific person — someone whose energy matches yours in ways that go beyond compatibility charts.
If you’ve ever wondered whether the universe has already chosen someone for you, your birth chart holds that answer.
→ Discover what your birth chart reveals about your love life
