This is why fatherhood is another example of those artificial meme performance niches that men have carved for themselves in order to appear essential. A father isn't actually doing anything important or irreplaceable, but you are tasked with pretending that fatherhood does something sacred. Of course if you ask people to specify what it is, it's always abstract immaterial nonsense like "having a male figure in your life" or "authority". It's never anything with immediately evident utility like cooking, cleaning, providing, caretaking, gestating or nursing.

This is the nature of a male. If he can get away with getting everything and giving nothing, he will do just that. If he can get away with cheating, he will cheat. The only factor he considers is whether he'll get caught and lose his main relationship, nothing else. There is no such thing as a man who goes on a business trip, gets approached by a woman and says "sorry, I'm married".