He's a manipulative asshole but I'm not sure this post makes you any better... I mean let's be honest here, he did get an escort on purpose BUT it was an open relationship. It shouldn't have affected you. The fact that you fought over it goes to show that you just wanted it to be one way. So like the rest of the reddit commentors, I suggest for you to grow up and figure it out for the sake of that child. You both chose this. That child didn't.

edit: fixed a grammatical mistake