hi
romeo
He had to leave, for the "police" was on their way. He had no choice but to go...
The Watch. Romeo finds her and thinks she is dead and kills himself. Then Juliet awakes and finds him dead. The Friar returns and tries to convince her to leave the tomb with him but she refuses. The Friar hears the Watch coming and flees the tomb. Juliet stabs herself. The Watch enters the tomb and find Paris, Romeo and Juliet all dead. The Prince, the Capulets, and Lord Montague arrive. Balthasar and the Friar explain what has happened and they all make up.
Because he heared the noises from outside of the tomb.
To break into Capulet's tomb
Balthazar is unable to enter the tomb with the Friar because he is not allowed to accompany him due to religious beliefs or customs, or because the rules of the tomb or site do not permit animals. Additionally, the tomb may be too confined or dangerous for an animal to enter.
because he thinks he hears the capulets coming from outside and wants to escape before they find him
Love.
Because he knows Juliet is about to wake up and Romeo will not be there, since Friar John was not able to deliver his message.
Juliet refused to go.
Two more corpses than were expected. He expected Tybalt to be there, but not Paris or Romeo. He expects Juliet to be there but she is not a corpse. Yet.
Friar Lawrence requests a crowbar to open Juliet's tomb and a letter to write to Romeo explaining the situation with Juliet.