Juliet and her Nurse have been together since Juliet was born. She was the one who nursed Juliet as a baby, and she was with her far more often than Juliet's mother was. This closeness is significant as it is the Nurse who Juliet trusts to relay messages to and from Romeo - It is the Nurse who truly knows and understands the yearnings of Juliet's heart, and who tries her best to help Juliet get what (who) she wants to make her happy.