Understanding what's in a narcissist mind helps us realize that the problem is NOT coming from us but from them.
They are sick and there is nothing you can do about it.
The best way to be happy is to stay away from them.
Leaving them is not easy but the only way to heal.
Here is a great article from Psychology today, titled: Inside the mind of a narcissist, written by a former FBI agent.
I like what you have written but for a person like me, it’s not easy to move on. It’s been 8 years we separated and not a day passes by when I don’t think about him, the time we spent together, the promises we made to each other. Sometimes I feel suffocated, wish I was dead and forgotten.... wish I never met him.