To accurately determine Romeo’s tone in the passage, I would need to see the specific passage referenced. However, based on general knowledge of Romeo's character in Shakespeare's "Romeo and Juliet," his tone can vary significantly throughout the play.
If the passage expresses feelings of sadness or reflection on love lost, "melancholy" may be the correct tone. If he expresses skepticism or surprise about a situation, "disbelieving" could apply. If there is an element of fear or anxiety, then "fearful" might be appropriate, and if he is expressing remorse or seeking forgiveness, "apologetic" would be the best fit.
Please provide the passage or more context for a more precise answer!