Who says the following and why?

griefs of mine own lie heavy in my breast,
which thou wilt propagate to have it press'd.
with more of thine: this love that thou hast shown.
doth add more grief to too much of mine own.
love is a smoke rais'd with the fume of sighs;
being purg'd, a fire sparkling in lovers' eyes;

friar laurence is discussing the nature of love.
friar laurence is lamenting about how dangerous romeo's love turned out to be.
romeo is pining over his banishment from juliet.
romeo is pining over rosaline.