Romeo's character flaw is that he falls in love too easily. He doesn't find anything out about juliet before he marries her.
Moment of Critical Discovery
Give me your strongest poison
Romeo shows a lot of pride in himself when Tybalt has a dual with Mercutio and Mercutio is killed. Romeo gets mad and kills Tybalt to avenge Mercutio's death and this leads to Romeo's banishment. This shows Romeo's pride because Romeo knew that if he killed Tybalt he would be punished but he still killed Tybalt to get his revenge
Fate Worse Than He Deserves
The reason Romeo has a reversal of fortune is the same as when he demonstrates pride in himself. When he kills Tybalt this causes him to be banished and him being banished is the cause of all of his other misfourtune.
Pity for Tragic Hero
Do you want to be friends now?
Romeo's moment of critical discovery is when he finds out that Juliet is supposedly dead because Friar Laurence's letter didn't get to him. He realizes that his love for her caused her "death" so he buys poison so he can kill himself next to her.
Romeo's final consequence is that he and Juliet both committed suicide when neither of them had to.
After Romeo and Juliet die Friar Laurence tells everyone that they where married and what they had been through and their families stopped fighting and became friends.