This quote shows that Juliet is under quite a lot of pressure and cannot go on for long. With this she exits.
Juliet has lived through many problems but this is her worst one yet: she is married to someone who has killed her cousin, she cannot tell anyone about her marriage, she has no one to turn to and she is about to be forced to marry someone whom she doesn't even know.
The audience might have gathered that she will not get married to Paris at any rate, so what will she do? Juliet will have to make a decision fast because time is running out. If she goes to Friar Lawrence what advice will he give her? The audience already know that the play ends in tragedy; because of the prologue will she only get peace after death? The audience will want to see what happens.
This scene is important dramatically because of its content. It is full of high emotion and passion between the characters. What happens in this scene also further the plot because the advice Friar Lawrence gives later leads to the death of two lives.
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