Let’s be real for a second. If you’ve ever been burned by an ex and immediately sprinted to Co-Star or TimePassages to see their birth chart, you aren't alone. We want answers. We want a reason why someone would blow up a perfectly good relationship. Astrology doesn't give people a free pass to be a jerk, but it does highlight certain behavioral patterns and psychological needs that, when left unchecked, lead people toward infidelity.
When people search for astrological signs most likely to cheat, they usually expect a list of the "bad" signs. Maybe you’re looking for Gemini or Scorpio. But it’s never that simple. Astrology is a language of energy. Every sign has a "high" expression and a "low" expression. A Gemini can be the most loyal, communicative partner you've ever had, or they can be a dual-faced nightmare. It depends on the person’s maturity, their Venus sign, and—honestly—their own choices.
That said, some zodiac archetypes are naturally more prone to the specific types of restlessness or emotional detachment that make cheating more likely.
The Air Sign Dilemma: Curiosity vs. Commitment
Air signs (Gemini, Libra, Aquarius) live in their heads. They crave mental stimulation. For them, a "mental affair" often happens long before anything physical occurs.
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Gemini: The King of Boredom
Gemini gets a terrible reputation in the "cheating" department. It’s the twin thing. People think they have two personalities, one of which is secretly dating a barista while the other is making dinner for you. It’s not that they’re inherently deceptive; it’s that they are terrified of being bored.
Gemini is ruled by Mercury. They need constant input. If a relationship becomes a routine of "what do you want for dinner?" and "did you pay the electric bill?", a Gemini’s mind will start to wander. They don’t necessarily want to leave you, but they want to feel that spark of new information again.
Libra: The People Pleaser
Libra is an interesting case. Ruled by Venus, they love love. They hate conflict even more. This creates a dangerous cocktail. A Libra might find themselves in a situation where they are unhappy, but instead of breaking up—which involves a messy, uncomfortable conversation—they start looking for validation elsewhere. They are the masters of the "micro-cheat." A flirty DM here, a "harmless" lunch there. They love being liked. Sometimes, they like being liked so much that they forget where the boundary is.
Fire Signs and the Need for Conquest
Fire signs are about heat, passion, and the chase. For an unevolved Aries or Sagittarius, the "hunt" is often more exciting than the "catch."
Sagittarius: The Eternal Bachelor(ette)
If we’re looking at astrological signs most likely to cheat purely based on a need for freedom, Sagittarius is often at the top of the list. They are represented by the Archer, always looking at the horizon. Sagittarius views life as a series of adventures. Sometimes, they view people that way too.
They value truth, which is the irony. A Sagittarius might actually tell you they’re unhappy, but they’ll do it while they already have one foot out the door. Their cheating is usually impulsive. It’s a "it happened in the moment" type of situation, usually involving a trip, a party, or a sudden change in scenery. They don’t like being fenced in. If they feel the relationship is becoming a cage, they’ll find a way to break the bars.
Aries: The Impulse Problem
Aries is ruled by Mars. They are the infants of the zodiac. They want what they want, and they want it five minutes ago. Aries usually doesn't plan a long-term secret affair. They aren't that organized, honestly. If an Aries cheats, it’s usually because of a lack of impulse control. They got caught up in the heat of a moment and didn't think about the consequences until the next morning.
The Surprising Risks: Earth and Water Signs
You’d think Scorpio or Capricorn would be the "safe" bets. Not always.
Scorpio is the sign of sex and secrets. While they are incredibly loyal when they are "in" it, if a Scorpio feels betrayed or neglected, they might engage in "revenge cheating." It is calculated. It is cold. And you might never find out unless they want you to.
Pisces, on the other hand, cheats through escapism. They live in a fantasy world. If reality gets too hard—if there are bills, or kids crying, or a partner who is emotionally distant—Pisces might "slip" into a fantasy with someone else. They often view it as a soul connection, which makes it easier for them to justify the betrayal to themselves.
It Isn't Just the Sun Sign
Looking only at the Sun sign is like looking at the cover of a book and claiming you know the ending. To really understand the astrological signs most likely to cheat, you have to look at the "Shadow Side" of the entire chart.
- Venus in Gemini/Sagittarius: This placement often indicates a need for a lot of variety in love. These individuals might struggle with traditional monogamy unless their partner is also their best friend and travel companion.
- Mars in Scorpio/Aries: High libido and a need for intensity. If the relationship lacks "fire," they might look for it elsewhere.
- The 7th House: If there are challenging aspects to the house of partnerships (like Uranus or Pluto), the person might experience a lot of upheaval or a need to "disrupt" their own happiness.
Professional astrologers like Robert Hand or Liz Greene have often noted that infidelity is less about the sign itself and more about the "squares" and "oppositions" in a person’s chart that create internal tension. Someone with a lot of "hard" aspects to Neptune might struggle with boundaries and honesty, regardless of whether they are a Leo or a Virgo.
How to Spot the Red Flags Early
You don't need a PhD in astrology to see the signs, but knowing the "low vibe" traits of your partner's sign helps.
If you’re dating an Air sign, watch for the "checked out" eyes. When they stop talking to you about their ideas, they’re talking to someone else.
If you’re with a Fire sign, watch for the sudden loss of enthusiasm. Fire needs fuel. If they aren't excited to see you, they're looking for a new spark.
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If you’re with a Water sign, watch for the "vague-ing." If they become overly secretive or "dreamy" in a way that excludes you, they might be emotionally investing in a different world.
Earth signs (Taurus, Virgo, Capricorn) are the least likely to cheat because they hate wasting resources. Cheating is messy. It’s expensive. It’s inefficient. But if an Earth sign does it, it’s usually because they’ve already decided the relationship is a "bad investment" and they are looking for a new one before they officially close the account.
Actionable Steps for Relationship Security
Understanding astrological signs most likely to cheat shouldn't make you paranoid. It should make you proactive.
- Check the Venus Sign: Find out their Venus sign. This tells you how they want to be loved. A Venus in Taurus wants physical touch and good food; a Venus in Aquarius wants space and intellectual debate. Give them what they actually need, not what you think they need.
- Foster Open Dialogue: Gemini and Libra cheat because they feel they can't say the "mean" thing. Create a space where it's okay to say "I'm bored" or "I'm unhappy" without the world ending.
- Keep the Mystery Alive: Especially for Fire and Air signs. Don't become a predictable habit. Change the routine. Go to new places. Keep them guessing just a little bit.
- Look for the "Saturn" in the Chart: Saturn is the planet of commitment. A person with a strong Saturn (especially in the 1st or 7th house) is much more likely to stick it out when things get tough, even if their Sun sign is a "cheater" sign like Sagittarius.
Ultimately, astrology is a blueprint, not a destiny. A person’s character is built by their choices, their upbringing, and their level of self-awareness. Use the stars as a guide to understand the "why," but always hold people accountable for the "what." If someone shows you who they are, believe them the first time—regardless of whether they’re a loyal Taurus or a wandering-eye Gemini.
Check your partner's Venus and Mars placements to get a deeper look at their loyalty profile. If you see a lot of mutable energy (Gemini, Virgo, Sagittarius, Pisces), focus on maintaining variety and open communication in the relationship. If you see a lot of fixed energy (Taurus, Leo, Scorpio, Aquarius), focus on loyalty and depth, but be wary of stubbornness or "revenge" tendencies. Knowing the map helps you navigate the terrain, but you’re still the one driving the car.