Somethings such as blowing up the WTC and slaying such a large number of innocent people is certainly malo(as in bad) but it's very nature. An older man falling for a younger woman is not bad by it's nature. She was an adult.

Now if he had raped her, that would be wrong by it's nature. But he did not. He didn't even have sex with her. And if he had, there would have been nothing wrong with two consenting adults doing as please.