It was the same lines over and over in this endless act.

It was easy to say around other people. It was easy to pretend. When you’re an actor, your lines are always the same. But what they never do is change the lines while still in the play. Even if doing so, it comes out into a much happier ending or a sorrowful conclusion. In the end the lines will remain intact and will be said over and over again. Why can’t they change it?
Because it ruins the show.