This is what happens when you cheat and the other person knows about it. They hold it over your head because they CAN'T forget. Sounds like he didn't even forgive either.
So your best move here is breaking up with him. He won't change and your now a prisioner of this who wants to live that way in life? You will remain miserable until you leave him.
Then do your best to not repeat this behavior with the next man.
A woman cheating on a man if different to a man than him cheating on you cheating with a women. They say its only physical and for women its more of an emotional encounter. So you were not getting what you wanted in this relationship someone you made you feel special.
You can do anything you want to with your life if you are not married.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.