Ex's Ego

After someone breaks up with a significant other or gets broken up with by a significant other that was out of their league, they become super cocky and arrogant but most of all narcissistic . They become overly confident in their ability to pick up chicks. You start to see it a little during the relationship but it really flourishes after the relationships demise.

"didn't you used to have a crush on David?"
"yeah, I did but then that girl broke up with him and his Ex's Ego blew up."