The friar states that "violent delights have violent ends," meaning that anything so intense and passionate will die just as passionately. He is also concerned that Romeo and Juliet will burn themselves out on one another, like "fire and powder.
-They declare their love for each other -Romeo leaves to find the Friar -Romeo hides from friends after the ball -Romeo is joking with friends -Nirse tells Juliet Romeo's message -Juliet goes to the Friar -Juliet arrives and they are married