His only regret. The stoic man who killed his brother had but one regret: that faux photo on his bedside table. No, it's real, wasn't it? There was a girl in that picture. Who had ever heard of Sasuke Uchiha liking a girl? And then that smile. Sure, the young Uchiha could smirk, but smile wasn't in his vocabulary.
That picture was stolen from someone. The climax of the story taken away to stop time from ending it. Yet something pained the Uchiha's heart. Time somehow did stop it, forcing Sasuke to be the one who ended it in an attempt to save what he treasured most.
"Of everything we could have been."