Answer:
Romeo decides to attend the Capulets' party because he wants to see his love, the fair Rosaline.
Step-by-step explanation:
In Act 1, Scene 2 Romeo is in love with Rosaline, whom he thinks is the most beautiful woman. Benvolio teases Romeo saying that he thinks so because he has not seen more women and says that he will introduce him to more beautiful women if he goes with him to the Capulets' party.
Romeo agrees to attend to the party but actually he does it so he can see Rosaline.