See, Ibuki? This is why you should have learned the wisdom of "none of my fucking business". Reo's affair was not only not harming the team (so far), it was helping it.
What's better for the world? An adulterous dude helping others defeat monsters and saving lives or exposing said adultery and cutting humanity's only line of defense's power by 3/5s?
This is why everyone hates lawful good.