Having met and discovered his true love in Act I scene 5 during the party scene, Romeo withdraws, only to scale the orchard wall of the Capulet residence and try to find Juliet again in Act II scene 1. Note how at the beginning of this scene Benvolio and Mercutio are trying to find Romeo, and Benvolio notes where Romeo has gone:
He ran this way and leapt this orchard wall.
However, Romeo hides himself from them so he is free to enter the orchard and go up towards the balcony of Juliet, where he is able to remain unseen for a while and overhear the words of his love before declaring his presence. The famous balcony scene is one of the jewels of literature and occurs in Act II scene 2.