My bf has some inappropriate talks with a girl he used to have sex with, should I be concerned even though she is in a different country?

I think you would be happier if you concentrated on your own life and what you want from it rather than his life and trying to control him. In case you haven't noticed you can't make anyone else do anything, not even him. He already knows how you feel, and from your own description there is no indication that he is going to be what you want.

Stop trying to turn a zebra into an antelope, because an antelope is not better than a zebra, it's just different. If you would rather have a antelope, go find one and let the zebra have his own life - the way he is happy living it. Do it now before you have kids with someone so inappropriate for your needs.

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.