Dr Ramani is one narc expert to follow.. here's another I recommend:

WHAT THE NARCISSIST REALLY WANTED WITH YOU - YouTube

Watch him.. Andrew. He gives all sorts of great info and advice on healing from narc abuse.

Re-reading your lists of all the crap that he's done helps tremendously. That's what I repeatedly did during times of confusion. Granted, I slept with my ex narc twice after separating... be prepared for the hoovering and love bombing tactics to keep you hooked and from divorcing. That's what's likely coming next. Unless they've found new supply and have discarded you, they will hoover and love bomb. Even when they have found new supply, they tend to come back around to make sure you're still hooked on them. It's all about bolstering their fragile egos. They feed off of attention, positive or negative. He feeds off of you. So, just be prepared for what is likely to come, stay strong in your stance and follow through with divorce. They make promises. break them and never change.