war of brotherhood

Itachi's plan was to die in presence of Sasuke. So Sasuke and Itachi fough, Sasuke tried his best to kill Itachi and Itachi kept on playing along so that he can exhaust Sasuke chakra and drag Orochimaru out of his body and kill Oro permanently. At the end Sasuke's chakra ran out, Orochimaru broke free just as planned and emerged out in form of a giant 8 headed snake and tried to attack Itachi but Itachi used his jutsu Susanoo to finish him off for good. Sasuke now had used whatever he could to kill Itachi but failed. So at the end Itachi despite throwing the fight won and Sasuke was pinned against the wall shaking in fear with Itachi apparently reaching to plug-out his eyes but pokes him on the forehead like he used to when they were young, says sorry and then kneels over and dies suddenly. Sasuke remains standing in complete shock and then faints. The end.It turns out later that Itachi was not only throwing the fight for getting rid of Orochimaru for Sasuke, but also already dying of some deadly illness and choose Sasuke to credit his death by dying while fighting him so that Sasuke can be hailed as a hero in Konoha for killing the murder of their clan and get stronger by awakening his MS. And as you may have already figured out Itachi was a good guy all along