Narrator/Jack (Edward Norton)’s Timeline and Summary

Our narrator has a gun in his mouth, held there by Tyler Durden.
He flashes back to how he got to this point:
It all started when he started attending support groups for diseases/ issues that he doesn't have.
At one of these groups he meets Marla, who also doesn't belong there.
When his apartment explodes, our narrator calls Tyler Durden, whom he met on a business trip, and moves in with him.
The two men start fight club.
Our narrator starts to get jealous as Tyler expands fight club without him, eventually evolving it into Project Mayhem.
He gets to the bottom of Project Mayhem, and finds out that he is actually in charge of it. He is Tyler Durden. Le gasp!
Our narrator/Tyler tries to stop the big plan to blow up some buildings.
He succeeds in dismantling one bomb and "killing" Tyler by shooting himself in the face. We're not sure how it works, but it does.
Marla shows up just as other buildings explode. They hold hands and watch society collapse. How romantic!