Friar Laurence does although have good intentions. When Romeo comes to him about his new found love Juliet, at first he was hesitant because of his past lover Rosaline. But when Romeo made it clear that he loved Juliet and wanted to marry her Friar saw the good that could come from this situation. He believes that once Romeo and Juliet get married the feud between their families, the Capulets and the Montagues, will end because of the marriage of their children. Friar Laurence believed that since the families were both very religious they would not let Romeo and Juliet get a divorce because that was a sin, therefore the families would find a way to get along.
Nurse however sets up Romeo and Juliet without thinking. She does this because Juliet convinces her that Romeo is her true love. But Juliet is very young and does not know what it truly means to love someone yet, and Nurse should know that. When Romeo becomes banished Nurse gains some sense. She then tells Juliet to forget about Romeo and that she should just listen to her parents and marry Paris. I think that this is what Nurse should have been telling Juliet from the beginning.