Why Virgo is unfaithful?

Virgo hardly is unfaithful because his moral principles are one of his most precious treasures.
Practical and analytical he will review a situation a thousand times before surrendering to what he feels.
If his partner can withstand the Virgo criticism and moulds to his perfectionism, it is rare clandestine affections arising.
His quest for purity and perfection will try to suppress any purely instinctive exaltation.
Tip: Help him to overcome his modesty.

What is the most unfaithful zodiac sign?