They were both similar in that they killed themselves because they thought that the other was dead.
Juliet faked her death with a potion from Friar Lawrence, and Romeo saw her, and killed himself....
The story of Romeo and Juliet ended in death because they were secretly married, but then Romeo was banished for killing Juliet's cousin, Tybalt. While he was gone, Juliet's parents want her to marry...
No, it is their parents' strife. In prologue it is written 'with their death bury their parents' strife'. This means the feud between the families is ended when their dearest children die as a cause...