At the end of Fight Club A lot of people get confuse to how it ended, here is a small but detailed description of what happened.
In the ending scenes of fight Club The Narrator (Main Guy) Is sitting on the Chair and Tyler is Holding him at gun point, The gun then Appears in the Narrators hands and then he shoots himself in the head killing Tyler.
Tyler Isn’t real, He’s a Side of the Narrators Personality that has its own Control of the Narrators body, The Narrators mind Makes a hallucination that Tyler’s there and that the gun is in his hand, If you were watching it from another view The Narrator would be talking to himself (with the gun in his own hand) or just mentally thinking this Argument. Anyway, The Gun is not in Tyler’s hand, it’s in the Narrators hand and always has been (his mind is just thinking that it’s not because that’s what the other personalities mind is thinking), When he shoots himself he doesn’t shoot his brain he fires the gun and the Projectile exits his cheek just under his ear but the real personality makes Tyler’s personality think that it has been shot in the head and killed by the bullet (Because it thinks separately to the other personality), Now Tyler’s personality is still there and thinking but the Real personality can come and take over it and get rid of it because it thinks it’s dead. Now all this might be hard to get your head around but it helps a bit.
Things like this have been done before to destroy other personalities because they become Violent, Murderous or start attacking themselves to become the Dominant Personality. Nowadays they just put them through immense therapy.
I hope this helped some of you to understand the ending.