-[I'll just abridge this part, you guys can ask me to expand on it later on] After being trapped in a never-ending genjutsu that has Naruto live his entire life, at least 90 years each time, filled with regret over not getting Sakura or becoming Hokage or being a bad father, over and over again, Naruto breaks back into reality.
-He sees that they have won, and the battle is over.
-He looks at Sasuke, whom looks back at him; Sasuke begins to try and play him, seeing it as a way back into Konoha to do whatever he wants.
-Naruto says "Sure, you're my best friend to the end, Sasuke". He comes over and pats him on the shoulder, smiling weakly as he looks him in the eye.
-He then takes out a knife and stabs Sasuke in directly in the heart, holding Sasuke's hand on his sword so he can't fight back. As Sasuke bleeds out and realises that this is the end and begins to panic, Naruto starts to yell at Sasuke, "You made me do this, Sasuke, I'm so sorry. I'm sorry you aren't you, I'm sorry that everything has happened to you like this. You didn't deserve this, we didn't deserve this kind of life." As Sasuke fades away and finally dies, Naruto brings him closer into a deep, mournful hug as he weeps loudly for his friend. "I'm so sorry, I'm so sorry."