the consequences of watching Marla Singer die

WARNING: This post contains massive spoilers for the huge plot twist at the core of the film "Fight Club", and I can not stress enough how little understanding you'll have of this post if you've never seen that most exceptional film. And now, on with the show.
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Wow. I had never noticed that before. In the kitchen after learning that Marla spent the night screwing Tyler, Jack's voiceover says "if only I had wasted a couple of minutes and gone to watch Marla Singer die, none of this would have happened". But he's not saying that to himself there in the kitchen. It's part of the larger voiceover, which results from the entire story being told in flashback, as he's sitting in the room where Tyler had stuck a gun in his mouth.

So, when he says "none of this", he doesn't mean Marla being there in his home, screwing his best friend, and intruding on his life like she'd intruded on his support groups. He's referring back to the pre-flashback line "and suddenly, I realize that all of this: the gun, the bombs, the revolution... has got something to do with a girl named Marla Singer".

If only Jack had wasted a couple of minutes and gone to watch Marla Singer die, he wouldn't have found himself without his pants, sitting in a chair on the top floor of an empty skyscraper, while his best friend shoves a gun into his mouth and counts down the timer on the explosives in the basement...

Wow.