Well, you've got your answer, he became fed up with your nagging and went elsewhere. There is an old way, 'I may as well do what I'm being accused of.
You answered your own question. You kept accusing him and nagging him. But, did he actually do it?
That is what you did not know, nor did you have any real proof. I would be fed up with it too personally. My advice for next time is...don't be suspicious unless you find a REAL reason to be suspicious.
Also, there is no chance of you getting this boy back. Sorry to break your heart, but he's gone, and he's gone for good. Nobody wants an accusing girlfriend when they're doing nothing wrong.
You got what you deserved if you had no proof. If he was cheating the why would you want him back anyway?
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.