Mercutio and Tybalt got into a dispute and Tybalt killed Mercutio with his sword.
Romeo and Tybalt were in a fight. Romeo killed Tybalt.
After Tybalt killed Mercutio, So Romeo got mad and he killed Tybalt. Bonvolio was shooked, Mercutio was lying beside Tybalt dead.
What? Is Romeo alive?
Yes, he is but your cousin is dead, don't you care?
Romeo went to Friar Laurence's cell to tell him about everything that happened. Friar Laurence couldn't believe it and he ddn't know what to do so, he told Romeo to hide or else the capulets will try to find him and kill him.
the nurse entered julites room and told her that nromeo killed tyblt and that the capulet is looking for romeo to kill him.
then juliet ask rthe norsewhere was romeo, the nurse told her that he was with Friar Laurence
Then juliete ask her to go t Friar Laurence's cell to tell romeo that she wants him back