Marry up.

 NARCISSISTS DATE UP AND MARRY UP...

And here's why I think that is. By doing so, the narcissist wants someone who will make them look good....it's as if they are saying, “See who I'm with. I'm a heck of a person.” And you have something else the narc wants, such as your finances, or a willingness to stick with it at all costs. 

Often, the narc thinks you are an upgrade over the other supply, and they'll get more from you. It's never about what the narc says it's about...such as love. With the narc, it's always about getting, not giving. Narcs are takers, and we are givers, so you can see why things go wrong.  

Then, since you are above the narc, they have to run you down privately and perhaps to others when you don't realize it, simply because the narc knows you're the better person. 

It's weird, but in the narc's mind, you have to be demeaned, put down and belittled SO THE NARC FEELS AT YOUR LEVEL, or even better than you are. But, in reality, the narc knows the truth.

What else did you notice...what did the narcissist have to gain by being with you?