Of course he did. Cheaters cheat. Liars lie. They usually go hand in hand. Cheating isn’t an epic mistake, it’s a choice and usually a repeat choice.
I agree that ego is one of our biggest hurdles, but not sure he’s a good example because it creates a causation between ego and cheating. Not all people with big egos are cheaters.
Really, really good book about ego is Jill Bolte Taylor’s book, My Stroke of Insight.