Stop worrying about the guy who used you for a part-time toilet and his wife. Worry about your child. He is entitled to financial support from both parents.
You do not have the authority to deny him that right.
Go to court. You don't have to make waves, but he brought whatever wrath his wife unfolds upon himself. Maybe he will be compliant and she need never find out, since not hurting her seems to be your aim.
Regardless, he has an obligation and the baby deserves support from his father.
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.