Be easy on yourself. We are short-lived animals, stuck in the eternal present moment. How can anyone be sure of who they were before or what they thought or felt?
You loved someone, as well as you were able at the time. He loved you, too, in his own narcissistic way, until he didn't anymore. You both moved on, as living beings do.
He felt the need to rewrite his own history, to see himself as having spent all those years living a lie. How sad for him, to lose out on everything he could have learned from the experience of loving you. I hope you won't make that mistake.
You're wiser now, more careful with your heart. But I suspect you'll give yourself no less extravagantly if and when you get the opportunity to experience true partnership with someone who deserves your trust and adoration.