1 - They have added you on every social network after your first meeting. In addition, they refer to you as the love of their life, their "wife", and begin advancements on every boundary on your list.
2 - They will make an initial investment of time and/or money in a relationship. Once they have you hooked they withdraw their supports.
3 - They cheat or monopolize games from Scrabble to Truth or Dare. If it's a game based on a point system they will cheat simply by insisting that you play by their rules which are subject to change at a moments notice. In a game like Truth or Dare their truth is the only truth that matters. You'll find yourself strangely mute during this exercise.
4 - They do not hear the word "No". It seems to be a completely foreign concept to a narcissist. They appear to take it as a personal affront no matter what the circumstances. They can hear a hundred loud "no's" about a specific issue and one mumbled "yes". They'll hang you on that one "yes".
5 - They do not respect your personal space. On the other hand, don't you dare infringe on theirs. Dating a narcissist means that your every action is open to intense scrutiny. But, their every flirtation (and there will be far more than you can possibly keep track of) is not to be questioned.
6 - They will have several accounts on the same social media network that they will admit to using to cheat at on line games Chances are though, that if they cheat at on line games, they'll cheat in real life relationships too.
7 - They are the type of people that will tell you they have completed SEAL training. Meanwhile, they never made it through basic training. They will claim some advance knowledge or skill that will be beneficial to your future. Once they get called up to the plate they do something random like check Youtube for tutorials on their specific area of "expertise".
8 - They are the masters of deflection. "You're seeing things." or "If you did this ,,, I wouldn't have to do that" or "You keep packing my stuff .... " The only time the conversation becomes about you is when they want to play the blame game. The worst part is that in the grand scheme of things you know that it IS your fault. You let them suck you into their black hole of a life.
9 - They are cruel. They will belittle your accomplishments. They will make you cry into your dinner at a new restaurant. They will physically push you after a night of celebrating and chuckle if you stumble. They will try to sabotage any attempts you make at personal improvement.
10 - Finally, being with a narcissist will negatively impact every aspect of your life. Socially friends will start falling away and family will comment about how you are no longer the independent role model they admired. Financially, your effort and resources will go to helping your narcissist make more of themselves ... Even if they do have adequate resources of their own. (Oh, to top it all off, when all is said and done, your narcissist will claim you didn't support their dreams, wishes, or goals.) Physically, it's not uncommon to incur side effects (weight fluctuations, migraines, insomnia, & physical weakness) from being in a relationship with a narcissist. Psychologically, there is complete devastation. Treatment options for recovering from a narcissist resemble those for Post Traumatic Stress Disorder.