Sometimes people want to believe so badly, that they become gulliable. In addition, "A's" are expert liers, most even believe their own lies, so, that make them so much more convincing.
I too wanted to believe my ex, but, then common sense stepped in and I no longer believed his tall tales. I took off my rose colored glasses and saw him for who he really was/is, a bald faced lier.
Keep moving forward, skip his words, watch his actions.