Romeo's fault. He could of changed his miserable life into a happily ever after with Juliet.
First of all, Romeo is reckless which leads him to kill Tybalt. Romeo killed Tybalt because Tybalt was all furius that Romeo crashed the Capulet's party but instead of working things out Romeo takes out his sword and ends up killing Tybalt. ( “Thou, wretched boy that didst consort him here, shalt with him hence’’ “ This shall determine that [ they fight; Tybalt fall] “ III i
Secondly, Romeo falls in love way too fast for example In ( II ii 133 “ th` exchange of thy love's faithful vow for mine.) Romeo is asking Juliet to marry him. Romeo doesn't know a thing hardly about juliet only that she is stunning in his eyes. They barely met after one day and is willing to commit his life.
In addition, Romeo needs somebody to love. Romeo was so called “in love” with Rosalind ( “i aimd so near when i suppos`d you lov`d “ “a right good mark-man! And she’s fair i love.” I i 204-205 ) but goes to the
Capulets party and finds Juliet then decides to get freaky with her when he was sulking over Rosalind.
Next, Romeo is too impatient which leads him to go stalk Juliet at her house hiding behind the bushes.