I saw this article and could not help but think of you mle1115, notice it actually says in the article "four months" as you have said your relationship lasted.
Why Do Narcissists Lose Popularity Over Time?*|*Scott Barry Kaufman
These individuals never get to know YOU. They have their typical wine and dine charisma, but they don't have the "depth and empathy" that keeps a relationship going long term.
When I said to you, you are only grieving "the dream of", that really is what this individual could never provide you with. It's important to recognize this when spending time dating a new individual that may have might just sweep you off your feet, but may not have any more depth then that first burst of excitement. Many women think it must be their fault, a mistake because the reality is these individuals really never saw "you", but instead were simply looking for yet another individual to praise "them".