longing for the woman he is describing.
The sonnet form is typically used for declarations of love. This is especially true of Shakespeare's sonnets. In this sonnet, Romeo is talking about how he longs for the love of Rosaline. Unfortunately she is not an option since she's taken an oath of chastity and plans to never be married. Shakespeare uses sonnets in many other places throughout Romeo and Juliet. The prologue is a sonnet, as well as the conversation between Romeo and Juliet when they first meet.