When any of the partners suffers form Narcissistic Personality Disorder, The relationship will be a narcissistic one full of toxicity. 

Narcissistic Personality Disorder according to Mayo Clinic is mental disorder when an individual has an inflated sense of their own importance and a deep need for their admiration. Those with Narcissistic Personality Disorder believe they are superior to everyone else and have little regard for other people’s feelings. Interestingly behind this massive mask of ultra confidence lies the most fragile self-esteem vulnerable to the slightest criticism.

Today’s world is highly narcissistic visibly the “look at me” mentality promoted by social networks like Facebook, Instagram, etc. People are enamored by the image they present to the world. Professor Bushman of Ohio State University says narcissists are very bad relationship partners.

In a narcissistic relationship, your partner is most likely going to engage in manipulative or game playing behaviors and less likely to commit long-term.