Read the story carefully so you will know all the specifics. Set in Verona, Italy, Romeo Montague finds out about a party at Juliet Capulet's home where his love, Rosaline, has been invited. Romeo was not on the invitation list because of the Capulet family's hatred for his family. Romeo spies Juliet at the party, and it is love at first sight.
Consider the importance of feuds. The couple is separated because of a family feud. While at the party, Juliet's cousin Tybalt sees Romeo and asks Juliet's father if he can fight the intruder. Tybalt is told to be patient and ignore Romeo, but this leaves Tybalt very angry and ready for a fight.
Realize that killing someone has consequences. Romeo ends up killing Tybalt in a fight and Romeo is then banished by the prince for his crime. If the death hadn't taken place and the prince didn't banish Romeo, he and Juliet might have been able to find a way to be together.
Assume that risking everything over a crazy plot rarely works. Juliet asks Friar Lawrence for help and he tells her of a drug that will make people think she has died. They go through with their secret plan just as Romeo returns, only to find Juliet "dead" in her family tomb. The friar had sent a letter to Romeo telling him of the plan, but Romeo never received it. If Romeo had come to the tomb a few moments later, or if the friar had arrived earlier at the tomb, the friar would have told Romeo that Juliet was not dead.
Conclude that tragic coincidence and bad timing led to Romeo and Juliet's deaths.