Romeo and Juliet was a hetero love story; they got married; there was a tragic ending.
I don't see any parallel to BBM.
Umm.. I admit it's been quite a while, but last time I saw the play Juliet took the Friar's elixir the effects of which would mimic death - so that she could avoid the arranged marriage with Paris. Romeo who is exiled vows to poison himself in her tomb, where he finds and kills Paris, then poisons himself. Juliet awakes to find Romeo dead and stabs herself with his dagger. And everyone lives tragically ever after!
Well, except for Romeo and Juliet, of course, who are presumably in hell. In the gnarled wood of the suicides in the Seventh Level of Hell, to be precise.
Ya, Romeo and Juliet didn't get married. Their passion was illicit.