A narcissist paints a picture of themselves as being the victim or innocent in all aspects. They will be offended by the truth. But what is done in the dark will come to light. Time has a way of showing people's true colors.
Don't beat yourself up for not being able to realize who he really was from the beginning. At one time or another we all fall victim to an illusion. Stay true to who you are and what you truly want and things will fall into place.