I don't know if there is a mistake that only men make in relationships, but I will say that there are some mistakes that men tend to make more often than women. I would say cheating is a major mess up, especially if he is with a good woman and in a committed relationship.
I think the biggest mistake is cheating on your spouse. Then the mistake is one not being open with her once the initial romance is settled and not caring her for ever with some sweet words and a flower or stop appreciating her cooking and how she look when she comes from bathing and giving her financial freedom and taking them out once in a week or in two weeks. All this irresponsibility contribute to the biggest mistake and spoil the relationship.
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.