You didn't leave him though. You are still married. That being said, I wouldn't have any desire to sleep with my wife after she cheated on me.
There is more to attraction than the physical side of it. If you haven't figured that out yet at 31, you need to stop wasting his and your time.
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.