Well thats kinda why i said that in reality everyone wouldn't just leave but in a game they probably would just to make the ending feel worse, who knows maybe kirito finds out and blames everyone for no reason at all so thats why they leave him alone but i was more or so going for the generic "good" ending, bad ending trope then the 3rd one where we can say kirito wins..... or secret 4 ending where kirito finds out whats going on gets yui to mind control everyone to love him and he becomes the true protagonist and gets all the woman.......
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Well, then you could have said that Kirito is the one who leaves everyone.
Kirito: You knew and didn't tell me. You're false friends. Better alone than in bad company. Goodbye, you bastards!