He's now in love with Juliet instead of Rosaline.
There are three fight scenes in Romeo and Juliet--one in Act 1, one in Act 3, and one in Act 5. They are each intended to invoke different audience reactions. Shakespeare ups the ante with each fight, so that with the first we do not care about the outcome, but by the end, we dread it.
Juliet is upset at the end of act one because she learns that the handsome stranger she fell for is actually from the rival family, the Montagues. Romeo, on the other hand, is upset at the beginning of act one because he is heartbroken over Rosaline, who doesn't return his affections. So basically, they're both just a couple of lovesick puppies with a lot of drama to unfold.
A girl called Rosaline.
marketplace, verona
Yes, the events of act one take place in one day.
when Juliet calls Romeo a 'dove feathered raven' after he kills Tybalt - she is ashamed that he could be so evil but knows he is lovely too
WALLAHI
One example of hyperbole in Romeo and Juliet Act 1 is when Romeo describes Rosaline's beauty as "bright smoke" and her rejection as "hanging in the stars." These exaggerated statements convey the intensity of Romeo's feelings of love and heartbreak.
Romeo kills Tybalt. All of his misfortune and Juliet's spring from this one action.
Her father is trying to force her to marry Paris when she is already married to Romeo.
they prepare for the bad scenes
One example of this would be at the end when we know Juliet is not really dead but Romeo thinks she is.