Friar Lawrence attempts to convince Romeo that exile is a far more lenient punishment for murdering Tybalt than death would be, though Romeo cannot see it. When Juliet’s Nurse arrives, she explains that Juliet has been made similarly tearful and desperate by the news. Romeo is prepared to use his dagger to hack off the part of himself in which his name lives. Friar Lawrence chastises him for behaving so weakly and lays out the following plan.
First, he tells Romeo, “get thee to thy love,” and go to Juliet’s bedchamber, as they had already agreed upon for the night before the dispute with Tybalt (3.3.156). Next, Romeo should awaken early, before “the watch be set” so that he can sneak out of Verona to Mantua unseen (3.3.158). Third, Friar Lawrence says, they will “find a time” and a way to announce Romeo’s marriage to Juliet, get both of their families to agree to reconcile and put the feud behind them, beg for the Prince’s “pardon” for Romeo’s murder of Tybalt, and “call [Romeo] back” to Verona with nothing but joy and happiness (3.3.160, 162, 162). It’s an ambitious plan, certainly.
So, for now, Romeo is to accept his punishment – exile – and leave Verona, after spending his wedding night with Juliet, of course. Then, he must go to live in Mantua and wait to hear from Friar Lawrence regarding a plan to bring him home.