Not that it really matters, but "wherefore" means "why", not "where". Juliet wasn't wondering where Romeo was, she was lamenting that he was born a Montague.
> Beatrice: Why, how now, cousin! wherefore sink you down? (http://shakespeare.mit.edu/much_ado/full.html)
When your cousin faints, would anybody ask where they have just fainted?
There are many places in Shakespeare that are unreadable to a modern-English speaker without explanatory footnotes, but this isn't one of them.