It used to be and still is in many countries.
If you stand up and say vows and then lie to the other person and have sex with someone else why is it ok?
The affare hurts the other person more than someone steeling their stuff or taking a car and that is a crime.
So why is it not a crime to break up a family, to make children grow up with only one pereant?
When did it become ok to have an affare?
Sorry for spelling i'm dyslexic