The 'Last Friday Night' singer discussed her decision to include details of her divorce in the film while appearing The Tonight Show with Jay Leno on Thursday (June 21).
"I think that if you went to see the movie and it was completely avoided you come out of that theatre going, 'Hmmm...That's strange, I know something else did happen at that time in her life last year," Perry explained.
She continued: "I wanted to handle it very delicately with the most integrity I could possibly have and show people that, like, 'Look, yeah, I'm going through some of the same situations that half of America goes through', and somehow I landed on my feet and you don't have to lay down and die even if you feel like you're going to."
Perry previously admitted that she hid her pain after splitting from Brand because she didn't her fans to see her cry.
She has most recently been linked to Florence + The Machine guitarist Robert Ackroyd.
Katy Perry: Part of Me will be released on July 5.
Watch Katy Perry's appearance on The Tonight Show below: