“Did my heart love till now? Forswear it sight, For I ne’er saw true beauty till this night.”
He serenades Juliet in the balcony scene and shows his passion by putting his life on the line by risking being caught by the Capulet guards. They agree to marry each other, he has to mature as marriage is a lifelong commitment and he needs to provide for her.
After the marriage, Romeo tries to make peace with the fiery Tybalt and refuses to fight him even after Tybalt antagonises him by calling him a “villain”.
Mercutio accepts Tybalt’s challenge to Romeo for a duel as he thinks Romeo’s decline is the choice of a coward. When he is slain by Tybalt, Romeo loses his temper and looks for revenge; immaturity shows as he thinks short term and doesn’t think of the consequences. He is banished by the prince and is made to flee Verona. He describes his banishment as a punishment worse than death as he can never set eyes on Juliet again but everything living thing in Verona can.
When Juliet fakes her death Romeo visits her in the Capulet tomb, when he sees her he takes his own life to with his one true love.
Romeo changes throughout the play