"
it all
[All:]
This ain't a movie that I wanna see
A tragic story, starring you and me
Oh god we're stuck inside this scene
This is heartache on the big screen
The clock is ticking, and I'm out of time
The camera's rolling, and I forgot my line
My script is written now
Basically, the "movie" is the metaphor of his life (especially the love aspect).
It's actually "Yell 'cut!' we're stuck inside this scene." This means that they're stuck in the same phase all over again.. Maybe they have a relationship that isn't just working at all.
Also, it's "my script is ripped and now I see.. " This means that he's done with anyone or anything dictating how he should run his life.