Your ex probably got a thrill out of the things he did. Cheating and lying and generally pulling the wool over your eyes.
I honestly believe with some men that they take up that behaviour as a challenge, to make themselves superior by trying to make the victim look stupid. Then they lose more respect for the victim and round and round it goes.
By expressing your anger and frustration at the way he treated you, and how upset you still are, you are feeding the fire. He'll get off on the fact that you still pay him attention, and that he had affected you so much.
Stop giving him the attention.
The most frustrating way to hit a narc is to close the window on your World.
Leave him tying himself up in knots. Why doesn't she contact me, why isn't she angry, what's going on, has she met someone etc etc . Far more frustrating for him.
Focus that energy into something positive, like how arsehole free your life is now, and what you can do to make the most of it.