Romeo's impulsiveness nature is represented when he moves on from Rosaline to Juliet in less than a day.
Anagnorisis (critical discovery)
After Romeo meets Juliet and gets married to her his life is on the top of Fortune's wheel and believes nothing can happen to him.
Nemesis (the inescapable agent of downfall)
After fighting with Tybalt, Romeo kills him and when the Prince is alerted he exiles Romeo for his crime. This will not allow Romeo and Juliet to be together. After Romeo's high point his fortune is sent downhill.
Catharsis (releasing repressed emotions)
While in exile in Mantua, Romeo learns of Juliet's "death". Romeo knows that is life could not be the same without Juliet alive and seeks to commit suicide.
"Romeo, Juliet has died!"
Romeo obtains poison from a pharmacist in order to commit suicide. Romeo's purchase of the poison starts the beginning of the end. Romeo can no longer go back and keep himself from killing himself.
After arriving at Juliet's grave, Romeo discovers Juliet's "dead" body and commits suicide. Romeo released his repressed emotions because previously thought of committing suicide.