He's ignorant and a pig and taking advantage of you. You've done this for him before and he doesn't believe there is any expectation of having something in return, most people don't mind doing this but when someone is being blatantly rude. People like this should be ignored, he is not and was never a good friend to you and is playing the "I'm in the wrong and I am so selfish I don't see it so I'm going to make you chase me" card for attention and because he's very childish.
Seriously, be done with this guy. People who are like this aren't worth your time or your feelings because they will just move onto the next one. This guy needs to sort his own life out and stop taking people for granted.
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.