In this scene of comical relief in "Romeo and Juliet," the Nurse enters, followed by her servant Peter, who must carry some of the excessive material of her dress. Mercutio shouts that a sail is following. When the nurse asks for Romeo, he jokes about the Nurse. To this jest, she replies rather crudely,
An a' speak anything against me, I'll take him down, an a'were lustier than he is and twenty such Jacks; and if I cannot, Ill find those that shall.
The nurse warns Romeo against leading Juliet into
a fool's paradise, it were a very gross kind of behavior, as they say. For, the gentlewoman is young, and therefore if you should deal double with her, truly it were an ill thing to be offered to any gentlewoman and very weak dealing.
She tells Romeo that Juliet is very young and should not be deceived as it is most ungentlemanly. Fiercely protective of Juliet, the nurse does enjoy learning that Juliet is in love, however; she relishes the marriage plans, and she is a very important messenger for both Juliet and Romeo.
She warns Romeo not to "...deal double...' or double talk Juliet because she's young and inexperienced with boys. The Nurse doesn't want Juliet's feelings played with by Romeo. She tells Romeo that she has tried to talk Juliet out of wanting to be with him but should choose Paris instead because he's older and has more money, but Juliet still wants Romeo. Because the Nurse views Juliet as the daughter she never had, she wants Juliet to be happy so that's why she's sending secret messages from Juliet to Romeo. But she makes it very crystal clear to Romeo that it's not ok to play with Juliet's feelings because there will be consequences if that is his intention.