The one I’m sorry for is Lucy. She didn’t have an axe to grind but was the one ground down.
A normal person in Roosevelt’s position would have made a decision about marriage and children and, if he chose love over a bad family situation, he would have divorced and made a 2nd attempt at having a good relationship.
Instead, he chose his ambitions over both family and the woman he loved, who loved him. He chose to hurt everyone for a political position he might have believed was more important than what he wanted. But it’s more likely he was just a narcissist who liked to feel that he was the most important person in the world.
Hope Lucy had a good life in the 30 years away from him and afterwards.
I think you have identified the problem.