In act 1 Benvolio tells him that there are more fish in the sea than Rosaline, and better ones at that, so it's time for him to fish elsewhere.
Benvolio
No he doesn't.
He tells him to look for other girls
Benvolio is Romeo's cousin.
Benvolio counsels Romeo to forget Juliet by gazing on other beauties, but Romeo contends that the woman he loves is the most beautiful of all. Romeo departs, assuring Benvolio that he cannot teach him to forget his love. Benvolio resolves to do just that.
Benvolio advised Romeo to move on from Rosaline and attend the Capulet's party to compare her with other beauties. This advice ultimately led Romeo to meet Juliet, sparking their love story and setting the events of the play in motion.
As far as we know, Benvolio did not give any advice to any girlfriend of Romeo's. He advised Romeo to look for a new girlfriend, but the old one didn't need any advice, since she didn't want Romeo anyway.
If Benvolio is Romeo's cousin, then Montague (Romeo's father) must be his uncle.
In Act I Scene 1, Montague, in his second line, says "Speak, nephew, were you by when it began". The nephew he is talking to is Benvolio. If Benvolio is the nephew of Romeo's father, Benvolio and Romeo must be first cousins.
romeo confeses to benvolio that he is in love.
Yes. Benvolio is Romeo's cousin in Shakespeare's Romeo and Juliet.
No, Romeo thinks that looking at other beautiful girls will only remind him of Rosaline's beauty