Who in romeo and Juliet said you will withdraw but this intrusion shall now seeming sweet convert to bitterest gall?

The line "You will withdraw, but this intrusion shall now seeming sweet, convert to bitterest gall" is spoken by Romeo in Romeo and Juliet, Act I, Scene V. In this scene, Romeo and Juliet have just shared their first kiss, and Romeo is expressing his worry that their love will be discovered and forbidden by their families.