Everything seems to be going wonderful, up until the point of Tybalt’s death, caused by Romeo in a fit of passionate rage. It begins when Romeo confronts Tybalt, trying to make peace, when Tybalt requests to fight and is denied by Romeo, act 3, Scene 1, Line 67-68, “Boy, this shall not excuse the injuries that thou hast done me; therefore turn and draw.” Mercutio, against Romeo’s will, steps in and battles Tybalt until he meets his death, so Romeo takes initiative and slays Tybalt. Because Romeo has killed a Capulet, the Montagues now owe a life, but to keep the peace, the Prince compromises Romeo to be banished in place of a killing ( Act 3, Scene 1, Line 69) "Tybalt is gone and Romeo is banished". Romeo’s banishment unwillingly separates him from his lover, Juliet, which drives her to desperate measures.
Once Juliet realizes the difficulty of being able to see Romeo, she goes straight to the Friar Lawrence. Upon arriving, Friar Lawrence quickly senses her desperation, and offers to help. (Act 4 Scene 1 Lines 68-76) “Hold, daughter! I do spy a kind of hope, which craves as desperate an execution As that is desperate which we would prevent. If, rather than to marry County Paris, Thou hast the strength of will to slay thyself, Then is it likely thou wilt undertake A thing like death to chide away this shame, That copest with death