A great many people are saying that Juliet threatens to commit suicide at this point but she doesn't. At the very end of Act 3 Scene 2, after what the Nurse says about Romeo's banishment sinks in ("Some word there was, worser than Tybalt's death"), Juliet says the following things about her plans:
1. Talking about her parents, crying over Tybalt, she says "Wash they his wounds with tears? Mine shall be spent, when theirs are dry, for Romeo's banishment." She plans to do a lot of crying.
2. Apostrophising the rope-ladder, she says "He made you a highway to my bed, but I a maid, die maiden-widowed." and "Death, not Romeo, take my maidenhead". Either way, she is saying that she will lose her virginity to Romeo or die a virgin. But that does not mean she is planning to kill herself. It is more like regret that the night of carnal pleasure she was anticipating with such excitement at the beginning of the scene, looks like it is not going to happen.
3. And if that is what she is thinking, it does not last long, because hearing that Romeo is at Friar Lawrence's cell, she says "O, find him! Give this ring to my true knight. And bid him come to take his last farewell." Here she is definitely planning to stay alive, at least long enough for Romeo to come to her.
Juliet threatens to kill herself
To kill herself
Juliet sends him a ring.
He is banished from Verona, meaning he cannot see Juliet. He thinks it would be better to be dead than not to see his wife, Juliet.
He is really mad and disappointed. He'd rather be dead that to be banished.
Benvolio.
Juliet
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To kill herself
She threatens to kill herself, because life is no longer worth living without the love of her life.
Romeo reacted with despair and heartbreak upon hearing the prince's decree of banishment. He felt as though being separated from Juliet was a fate worse than death, and he was devastated at the thought of leaving Verona and his beloved.
Romeo views banishment from Verona as a fate worse than death because it means being separated from Juliet, the love of his life. He expresses despair and sees it as a punishment that is unbearable, as it prevents him from being with Juliet.
He is banished from Verona, meaning he cannot see Juliet. He thinks it would be better to be dead than not to see his wife, Juliet.
He is really mad and disappointed. He'd rather be dead that to be banished.
Benvolio.
Juliet
Juliet seeks comfort from Friar Lawrence and decides to take a potion that will make her appear dead. She plans to escape with Romeo once she wakes up.
Verona
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Tybalt.