There's really no way to do it without hurting him. The best way to do it is to be direct. Just tell him straight out you don't want to see him any more.
The longer you don't, the harder it gets and the more it will hurt him.
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.