Friar Lawrence went to the tomb to get Juliet out of there because she was about to wake up and he did not want to leave her awake, surrounded by corpses. He was going to bring her to his cell until Romeo can come and get her.
To break into Capulet's tomb
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.
"The Earth that's nature's mother is her tomb." (II.iii.11)
Romeo asks friar Laurence to marry him and Juliet in secret
Friar Laurence's letter is not delivered to Romeo because Friar John was kept in quarantine since there was a plague in his house. Friar John wanted to go to Mantua himself but he couldn't. Once Friar Laurence hears this he says: "Now must I to the monument alone. Within these three hours will fair Juliet wake. She will beshrew me much that Romeo Hath had no notice of these accidents; But I will write again to Mantua, And keep her in my cell till Romeo come." His plan is to go to the tomb, get Juliet then write a second letter. But Friar Laurence's second letter is never sent to Romeo because Romeo's servant Balthazar has already told him Juliet is dead. Romeo arrives at the tomb before Friar Laurence can even write the second letter, which results in Romeo killing himself, which results in Juliet killing herself.
He had to leave, for the "police" was on their way. He had no choice but to go...
To break into Capulet's tomb
Friar Laurence hurries to the Capulet's tomb to rescue Juliet and prevent her from harming herself after discovering Romeo dead. He plans to arrange for Juliet's protection and help her escape to a convent with the hope of eventually reuniting her with Romeo.
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.
Friar Laurence tells the watchman that he is hurrying to get to the Capulet tomb to prevent Juliet from waking up and discovering that Romeo is dead. He instructs the watchman to go and fetch the prince and bring him to the tomb.
Friar Laurence was created in 1597.
romeo
Romeo asks friar Laurence to marry him and Juliet in secret
"The Earth that's nature's mother is her tomb." (II.iii.11)
Friar Laurence belongs to the Franciscan religious order.
Friar Laurence is Romeo's confidant, and the play suggests Romeo has known him since he was very young as it implies that the Friar is a religious leader. Friar Laurence is to Romeo; what the nurse is to Juliet.
Friar Laurence's letter is not delivered to Romeo because Friar John was kept in quarantine since there was a plague in his house. Friar John wanted to go to Mantua himself but he couldn't. Once Friar Laurence hears this he says: "Now must I to the monument alone. Within these three hours will fair Juliet wake. She will beshrew me much that Romeo Hath had no notice of these accidents; But I will write again to Mantua, And keep her in my cell till Romeo come." His plan is to go to the tomb, get Juliet then write a second letter. But Friar Laurence's second letter is never sent to Romeo because Romeo's servant Balthazar has already told him Juliet is dead. Romeo arrives at the tomb before Friar Laurence can even write the second letter, which results in Romeo killing himself, which results in Juliet killing herself.