Romeo sneaks into the garden that Juliet's balcony looks over. It is there when Romeo asks Juliet for, "The exchange of thy love's faithful vow for mine."
I love you, will you marry me?
I love you too, of course.
Romeo goes to Friar Lawrence to ask him to marry Juliet and himself. The Friar was reluctant until he thought, "For this alliance may so happy prove, to turn your households' rancor into pure love."
Marry us. We love each other.
Fine, but only because it might fix the rift between your families.
Romeo tells the nurse to deliver this message to Juliet, "Bid her devise, some means to come to shrift this afternoon; And there she shall at Friar Lawence's cell, be shrived and married." Nurse shows her joy and promises to give Juliet his message.
Of course, my young charge will be so happy.
Tell my love to come to the church under the disguise of going to confession.
Juliet berates the nurse to tell her what Romeo said, but the nurse is having too much fun teasing Juliet, saying stuff like, "... is this the poultice for my aching bones? Henceforth, do your messages yourself." In the end, Nurse relents and relays Romeo's message to Juliet.
Nurse, please just tell me what Romeo said!
Oh darling, he said you should go to Friar Lawrence under the guise of confession to be wed!
Father Lawrence is committed to keeping the lovers apart, saying, "For, by your leaves, you shall not stay alone till Holy Church incorporates two in one." Back then, maidens were forced to stay pure for there weddings, and the Friar doesn't want any funny business happening in the Church.
Fine!
No, no, no. You must stay away from each other so that you're pure for the wedding!