She may not trust you if you ended it badly. She probably went out with your friends to make you jealous or mad. If I were you I would try to become good friends with her sinse her and your friend are going out, then when they break up you will have gained some trust back and she may find room in her heart to let you in again.
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.