He wasn't destroyed, but he did break. It is possible to be competitive and break... Hell it's possible to be winning the fight and break.
Victor Ortiz is a perfect example of a guy who breaks. He was winning the fights with Maidana and Callazo and pretty much gave up because he couldn't take anymore.
Mike Tyson was winning against McBride and asked his corner to stop the fight.
Zab Judah gave Mayweather fits in the first couple of rounds in their fight, but when he realized Floyd wasn't going anywhere he pretty much tried to start a brawl between the corners in order to stop the fight.
After the 4th round I genuinely believe that Cormier gave up on trying to win. He seemed only concerned with getting that one takedown so that Jones wouldn't have the satisfaction of shutting him down completely in the wrestling aspect of the fight.