Who proposes marriage to Romeo and Juliet?

Basically, Juliet proposes marriage. His answer will determine his sincerity.

"Three words, dear Romeo, and good night indeed.
If that thy bent of love be honourable,
Thy purpose marriage, send me word to-morrow,
By one that I'll procure to come to thee,
Where and what time thou wilt perform the rite"

Act II, Scene II