That would explain the numbing. Maybe you fell out of love with him a long time ago but stayed in the relationships for reasons you may understand more than I would and when you hear troubling/disturbing/heart-breaking news like such, you just .. don't care. Either way, you shouldn't be in a relationship where someone cheats on you more than once over the span of 10 years.
It sounds like both of you are unhappy and I would think parting ways from a relationship of over 20 years would be difficult, but from the sound of it, it doesn't seem like it'd be that hard. Are you even in love with this man anymore? He cheated on you more than once.. Had I been you, one is enough.
I know it's not my life so I won't speak too much on your situation, but I would evaluate why you're in this relationship and if you truly want to stay. Same for the douche that cheated on you. Good luck.
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.