Your personal experience does not change the scientific facts of female fertility nor does it change the math.
Your great fortune also doesn’t change this woman’s personal history. She wasted eight years on this narcissist who did not care enough about her on a personal level to NOT use her as a beard.
He thought so little of her, he didn’t even bother to tell her personally, she found out from a friend who read his coming out story.
Oh, go lecture somebody else.