You don't want to get in between her and her boyfriend?! Are you kidding? You've already done that!
You had no right at all to tell her you liked her! You stuck your nose in where it didn't belong right from the get go because you want what you want. And what you want is a girl with a bunch of issues: She cheats on her boyfriend - with you.
She lies to her boyfriend She continues to allow him to think she cares which is hurtful all by itself and that's even more than the hurt if she broke up with him. In fact, it's a bunch of BS on her part. She doesn't want to lose the stability of the relationship!
What that means is she is so immature and co-dependent upon a idea of a relationship that she has no ability to stand on her own two feet. Selfishly she maintains the façade that she cares about him so she can stay with him giving the illusion everything is fine because what happens if it doesn't work out with you and she loses him. She's playing both of you!
But hey, she'd never do those things to you, she'd be all mature and honest with you. Wrong! You didn't try hard enough.
All you had to do was walk away and don't tell me you couldn't because anybody can do that. Maybe the two of you belong together because neither of you can stand alone. I see nothing about her from your description that makes her worth anybody's 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.