As you get into describing this story he seems to appear slightly controlling/manipulative, and not very trusting of you. These are scary traits ........ like the person above said, dump him ASAP, it will only get worse if you allow this to continue the obsession seems great with him so. Find a way to do this calmly, and politely : eep.
Or if you really love him your gonna hav to find a way to get him to calm down the obsessiveness.
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.