The real question here is not why she is sabotaging your attempts to move on with your life, but rather, why are YOU allowing her to do this to you. If you don't have children together, then ignore her. If she calls, don't answer the phone, if she comes to your home, don't answer the door, don't return any voice mails or texts.
She'll get the message eventually. But to answer your question directly, she is trying to hang on to you in case her new relationship doesn't work out and she needs someplace to live and a man to pay her bills, etc!
Trying to move on is very different than having actually moved on. May was just months ago.
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.