Romeo is sad in Scene 1 act 1 because he is in love with Rosaline but she doesn't love him back.
Because he is in love
In Act 1, Scene 1
The only person Romeo kills is Tybalt.
He doesn't. Mercutio is not in that scene, and Benvolio and Romeo do not part company.
Almost all of the scenes of Romeo and Juliet are important to the dramatic experience in some way, but the story could be told in much abbreviated form using the following scenes: Act 1 Scene V The party scene. Romeo meets Juliet. Act 2 Scene II The balcony scene. They declare their love for each other. Act 2 Scene VI The wedding scene. They are married. Act 3 Scene I Romeo kills Tybalt and is banished. Act 4 Scene I Juliet goes to Friar Lawrence with her problem. Act 5 Scene III They die and the play ends.
Actually, Mercutio is killed in Act III Scene 1 when he duels Tybalt. Romeo tries to stop the fight, by throwing himself between the two, but Tybalt manages to stab Mercutio under Romeo's arm.
In Act 1, Scene 1
Tybalt calls Romeo a "villain" in Act 3, Scene 1 of Romeo and Juliet.
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.
The only person Romeo kills is Tybalt.
act 4 scene 1
"Out of her favor where I am in love." - Romeo, Act I, Scene I. This quote reflects Romeo's sadness and longing for Rosaline's affection, despite her lack of reciprocal feelings.
Act 1 Scene 5
He is in love with Rosaline, who has pledged to be a virgin forever to be a nun.
He doesn't. Mercutio is not in that scene, and Benvolio and Romeo do not part company.
Juliet finds out what happened in Act 3 Scene 1.
to protect romeo
its from romeo and Juliet scene 4 act 1