He is in love with Rosaline, who has pledged to be a virgin forever to be a nun.
Romeo is sad in Scene 1 act 1 because he is in love with Rosaline but she doesn't love him back.
In Act 1, Scene 1
In Act III, Scene III, Romeo is speaking to Friar Laurence and says, "What sorrow craves acquaintance at my hand". What he means is that he wants to know what bad news the friar brings that he should know.
There are five scenes in Romeo and Juliet which are scene 1.
Choose anything Romeo says in the last part of Act 1 Scene 1 after Benvolio says, "Good morrow, cousin." It's two or three pages of moping.
The only person Romeo kills is Tybalt.
Tybalt calls Romeo a "villain" in Act 3, Scene 1 of Romeo and Juliet.
Romeo is excited to go and "explore". He seems willing to go find other fish in the sea.
Act 1 Scene 5
He doesn't. Mercutio is not in that scene, and Benvolio and Romeo do not part company.
Romeo buys a ticket to the Capulet party from the servant in scene 1 of "Romeo and Juliet." This ticket allows him to attend the party where he meets Juliet for the first time.
There are four scene fives in Romeo and Juliet (one in each of acts 1, 2, 3, and 4). Which scene 5 are you talking about?