Ever since your death that kakashi did, when you we're still a genin kakashi accidentally used his chidori straight at your chest causing you to die then everything changed for Obito he was mad he loved you so much even if you loved kakashi he bacame a villain an enemy of the village part of the Akatsuki and now a very powerful evil man the 10 tails jinchuriki he would start a war just for you

"Kakashi will pay they would all pay once me and Madara start the next great ninja war later"