“Sound of music — not the Nazis obviously, but the baroness. Imagine you’re a wealthy, savvy, child free woman open minded enough to date a sulking widower with a billion children he ignores in favor of travel and partying– in other words, your lifestyle. You’re not into kids but you try to be a presence in their lives when he finally deigns to introduce you to them (same time he announces that he’s marrying you, so he’s a super great father).
You put on a cheerful face anyway, and when it’s apparent the kids hate you (you are a stranger after all!), you consider sending them to boarding school where they might benefit from, say, structure and attention and schooling that they are not getting at home from their father/endless rotating nannies.
Then the super virginal, younger au pair moves in, and your boyfriend suddenly decides he is totally into being father of the year again after his Austrian rumspringa, and dumps you.”
Agreed. Sociopathy is more 'nature' than 'nurture.'