In Romeo and Juliet, exile is a personal matter that becomes political: Romeo is banished for a private affair (revenge-killing Tybalt), in order to keep a public peace. And then that banishments ends up having private and public consequences: the deaths of two kids, and then a final, public truce between the Capulets and Montagues. So does the exile—which is supposed to be better than death—fail? Or does it ultimately succeed, by bringing peace back to Verona?
Death and exile are synonymous for Romeo and Juliet because they cannot bear to live apart. In itself, this identification suggests that their love wouldn't have lasted.
Juliet's threatened exile from her family is more dangerous than Romeo's exile, because she's a woman.