People tend to have very firm rules about monogamy in a relationship and, generally, are fairly non-negotiable in their reactions to infidelity.
It’s crap when someone cheats on you. You’re likely to be hurt, angry, and of course, take the betrayal personally. But there is more than one reason for infidelity and cheating doesn’t always need to mean that a relationship is over.
Who’s to even say that monogamy is natural? Couldn’t the idea of a person vowing to have sex with one person for a lifetime, be seen as less natural than a person having a number of different sexual partners throughout their life, as their tastes, interests and maturity changes?
A persons reason to cheat is individual and not always as cut and dry as many people would think.