Juliet beilieves the nurdsse betrayed her after Romeo was banashed for Mantua. Juliet was FORCED to marry Paris and she was explaining her feelings to the nurse, when the nurse said she should forget about Romeo and act like he is dead and just marry Paris, which Juliet did not see as an option.
That would be the nurse (Juliet's nurse). Juliet asks her to identify several guests to mask her genuine curiosity about only one. She feels betrayed. Romeo asks the nurse who Juliet is when she is near him on his way out and she tells him his love is the daughter of Great Capulet. He, too, feels betrayed.
The nurse offends Juliet by advising her to forget about Romeo and marry Paris instead. This hurts Juliet because the nurse has been her confidante and ally up until this point. Juliet feels betrayed by the nurse's sudden change in loyalty and support.
Juliet says "Blistered be thy tongue for such a wish" to the Nurse in response to her suggestion that Juliet should marry Paris. Juliet is frustrated and upset at the Nurse's suggestion because she thought the Nurse was on her side and now feels betrayed. Juliet wishes harm upon the Nurse for proposing something that goes against her feelings and desires.
At first the Nurse was talking Juliet into marrying Romeo, but then she changed her opinion. She then said Romeo was nothing but trouble and continued to "rip" on her husband which made Juliet very upset. Juliet (from my interpretation) feels betrayed by the Nurse who once encouraged Juliet to be with Romeo...
Juliet is mad at the nurse in Act 3, Scene 5 of "Romeo and Juliet" because the nurse advises her to forget about Romeo and instead marry Paris. This conflicts with Juliet's feelings for Romeo and her desire to be with him. Juliet feels betrayed by the nurse's advice and feels alone in her struggle to be with Romeo.
The nurse tells Juliet to "get on with her life" so -to-say. The nurse recommended that Juliet get married to Paris since Romeo had been banished from Verona, and that Juliet would never see him again, so she should move on and forget about him. Juliet's opinion of the nurse changed because she thought that the nurse was on her side, and wanted Juliet to be with romeo, so she felt somewhat "betrayed" when the nurse said this. By saying that it is alright to marry Paris, the nurse is saying that Juliet is not really married to Romeo, that their wedding was a sham and their wedding night a roll in the hay. To Juliet, who considers herself to be Romeo's wife, this is an outrage.
The Nurse. The Nurse counsels Juliet to commit bigamy, which Juliet sees as a betrayal. Of course, the Nurse could have betrayed her a lot worse, by spilling the secret of Juliet's marriage to Romeo, but it is probably enlightened self-interest which prevents her from doing so. After all, she was the one who got the rope ladder.
Juliet is close to her nurse because while her mother occupies herself with her duties with Lord Capulet, the nurse acts as Juliet's actual mother. In other words, the nurse is Juliet's caretaker. I can't believe I just did your homework for you.... ;)
In "Romeo and Juliet", Juliet becomes angry at the nurse when she advises her to forget about Romeo and marry Paris. After hearing this, she doesn't feel she can trust the nurse with her secret to fake death to be with Romeo.
Juliet
The Nurse. :)
The nurse's description of the fight and Tybalt's death leads Juliet to believe that Romeo has been killed. She interprets the news of Tybalt's death as a result of a confrontation with Romeo, and this misunderstanding causes her to despair.