"Finally, OOMOW, why do you want to be with the CPOS? He cheated on his fiancée, he cheated on you, and he probably cheated on the women who he was cheating on the both of you with. He's a piece of shit, his fiancée is a fool, and you're a vindictive, self-deluding, selfish coward. I'm not sure if you can all do better, or that any of you deserve better, but I do think you should all try."

Probably because he is fun to be around, a good lay in bed, and makes her and the other women laugh?

I fail to see why someone is a piece of shit because they do not stay monogamous/bend to societies norms for a "proper" relationship. Why is he the POS and not any of the other parties?

if you can't see why he's a POS, i feel sorry for anyone unfortunate enough to be in a relationship with you.

he lied to multiple parties. it isn't the lack of monogamy that makes him a POS. if they were ALL ok with it, no problem. it's deluding people into thinking that he was interested in monogamy when he was not. polyamorous relationships require trust and honesty, just like a monogamous relationship. OOMOW is clearly a POS as well though, there's plenty of guilt to spread around.