Not all unfaithful people are the same, and it would be good to keep that in mind.
According to the Zodiac, some are less loyal than others and have different ways to show it.
The emotional cheater ~ Cancer
As much as they are emotional and loyal to their friends and family, this loyalty disappears in the relationship. If their partner is not emotionally supportive, the Cancer will move on.
Making the fantasy come to true ~ Pisces 
The Pisces live in the fantasy world and like to misbehave. Their sexual desire is high, so sometimes it is in charge instead of reason.
The attention seeker ~ Leo
If it isn’t the center of attention, it will find someone else who will admire him. No one can keep a Leo once it feels trapped and unhappy. So it will look for someone else to make them happy again.
Looking for freedom ~ Aquarius
Aquarius likes to learn new things, and it cannot stay with one person for a long time. It might feel bad for a moment, but its’ desire for new things is more vital than its regret.
Cheating in the sack ~ Capricorn
When Capricorn is dating the right person, it will stay loyal. However, if it starts feeling wrong, they will become unhappy and look for someone else.
Even though it is the loyal Zodiac, they will still leave you for someone who can offer them more.