Faithfulness is not inheritance, it’s not in anyone’s blood. Likewise cheating and womanizing.
No one should ever give you the stinky excuse that s/he was born with cheating and unfaithfulness. It’s in no man’s gene to cheat!
Faithfulness is a choice. It is discipline.
It takes one who is has made the choice to be faithful and discipline to stay true in a relationship.
It’s a man’s choice to marry more than one woman.
It’s a woman’s choice to date more than one man.
There is nothing biological or spiritual attach to this.