Because she did not know that Romeo was hiding behind the bush and she thought he was a robber or something. And because at first she did not recognize him from the ball. To see why she was afraid, let's put it in perspective. Imagine you are on a balcony of your house, talking to yourself about a hot guy that you met at a party. Then, suddenly out of nowhere, a strange person shows up and declares his undying love for you. Then you find out that it was the guy from the party and start to think "Wow, creepy stalker dude. Should I get a restraining order?" What happened to her there would startle a lot of people.
Because both of they're families had an argument that has made them enemies. If she chooses to be with Romeo her family might disown her. If she were to marry Romeo he would also be disowned and therefore she would not be accepted into his family. So basically they were on they're own and her only gain would be love and potentially happiness, only everyone knows Romeo and Juliet had a tragic ending (it's Shakespeare not a Fairy Tale).
When Juliet talked to Romeo on the balcony, she was worried that they someone might find out.
because some weird guy named romeo is trying to get her by climbing up a tree
Juliet is only afraid of their love because if her father or mother finds out they will destroy her.
Romeo speaks up before identifying himself. Juliet does not at first recognize his voice, and so thinks it is a burglar or someone.
Because their families are enemies.
Because her father could come any moment
The Nurse promises Juliet that she will go find Romeo and talk to him for her
He's making arrangements for his wedding to Juliet.
She's looking for Romeo and because she wants to talk to Romeo about Juliet
The Nurse becomes angry and asked to talk to Romeo privately. Romeo and Juliet.
Romeo and Juliet (1935), Romeo & Juliet (1968) and Romeo+Juliet (1996).
Romeo
The Nurse promises Juliet that she will go find Romeo and talk to him for her
Most famously, Romeo and Juliet discuss their love in Juliet's backyard. Juliet is in her window and Romeo is in the bushes down below. It's in Act 2 Scene 2 of the play.
The Nurse promises Juliet that she will go find Romeo and talk to him for her
He's making arrangements for his wedding to Juliet.
No she does not. Juliet's parents don't even know that she married Romeo
Mercutio!
The nurse wants to talk to Romeo to deliver a message from Juliet in Shakespeare's play Romeo and Juliet. Romeo asks the nurse to tell Juliet to meet him at Friar Laurence's cell that afternoon so they can get married.
She's looking for Romeo and because she wants to talk to Romeo about Juliet
So that Romeo can talk to the Nurse and tell where and when Romeo and Juliet will be married.
The Nurse becomes angry and asked to talk to Romeo privately. Romeo and Juliet.
The message from Romeo is to arrange for Juliet to come to Friar Lawrence's cell for their wedding ceremony.