You bring up a good point kid, about monogamy. If you are from a culture that allows you more than one wife, then enjoy where you are from.

The writing was incomplete and just touched the surface of the cause of this cheating. Your character, Jake, was also at fault.

So much can be learned from when you started dating to when you married. How much time did he spend at work?

Was he randy enough to keep her happy?

Jake created the situation that let this happen. She may be at fault, but she is not alone.

Men with too much ego will say it wasn't their fault. The cheating is the boil popping but it slowly began and got worse.