Aries is a super competitive sign; if they feel like they aren't being revered to the full extent, they may try to get lovers to fight for them. Similarly, Aries are an active bunch, always on the go. If his or her partner can't keep up, Aries may stray into some uncharted territory with someone who can.
Loyal and a bit of a hopeless romantic, Taurus are very unlikely to cheat. However, as a sensual sign they enjoy romantic gestures and physical pleasures, so if they feel like their partner isn't offering them enough, they might look for someone with their same romantic sensibilities.
The twin sign is known for having a dual personality, both of which like to flirt. A lot. Indecisive and with an incredibly short attention span, be wary of keeping Gemini on his or her toes. If you can't banter with the best of them, you may find Gemini looking for better conversation elsewhere.
A sign that longs for stability and a happy home, Cancer is not likely to cheat. They are, however, likely to stay in an unhappy relationship far past its expiration date, which could lead to cheating as an escape route to avoid the hurt of just ending things.
The diva of the zodiac, Leo is a beautiful sign who falls prey to his or her sexual and hedonistic desires, but Leo is also very loyal. If Leo is being treated like they're the star of the show (and kept sexually surprised), there should be no issues with the lion's fidelity.
Virgo can be a little bundle of nerves, hardly able to balance one relationship let alone two. Virgo is, however, a perfectionist in search of the perfect mate, so when it comes down to it, the picky sign may just pick someone else.
Flirtatious and romantic, Libra is always trying to find his or her other half. They crave stability and harmony in their life, particularly in their relationships. Unless they're feeling completely romantically or sexually neglected by their partner, Libras are not likely to cheat. They may occasionally flirt too far, but the loyal Libra is yours forever if you'll have them.
While Scorpios get a bad rap for being lusty and prone to cheat, this sign is just waiting for "the One" to change his or her ways, finding absolute loyalty once they do. However, until that day, Scorpio is a bit of a player, giving into passions and whims without much hesitation. If you end up with Scorpio for a mate, just make sure to keep things interesting and physical, and you're lover will stay true.
Constantly traveling and looking for adventure, Sags just wanna have fun. They're hard to pin down to a commitment in the first place, let alone keep interested. But if you share a similar love for life and exploration, and can give Sag room for freedom and independence, they can be a loving, loyal and exciting partner.
Capricorns are calm and disciplined, making them unlikely to cheat. Rather, a Capricorn may straight up leave a partner in the dust if someone comes along who can further the professionally-minded Cap's career. You can rest easy that your Capricorn lover won't likely cheat, but that doesn't necessarily mean they'll be yours forever.
Aquarius may take some time to find someone who respects their independence and intellectual nature, but once they do, Aquarius is unlikely to cheat. On the contrary, Aquarius tend to get so caught up in their own ideas and worlds that they forget about their partner, spurring them to be cheated on more often than doing the cheating themselves.
Pisces want to be swept away by love. Their dreamy countenance and desire for a larger-than-life love ensures Pisces will not cheat on his or her partner as the sign is ruled by emotions and empathy. If you make sure your Pisces always feels like your love is one for the ages, this sign is very unlikely to cheat.