Assigning two functions to the next button?

I have a slide that has two paths on it. The first time users click the next button it takes them to scene 1. When they finish scene one they are returned to the main slide. Now when they click next (for the second time) I'd like them to go to scene 2. I tried to set up a T/F variable (go to scene 2 is scene 1 is complete) but it always just goes back to scene 1. 

 

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