How does Romeo react to the name of Rosaline?

In the opening act of William Shakespeare's play Romeo and Juliet, Romeo expresses deep grief, lovesickness, and melancholia, particularly in relation to a woman named Rosaline. When Romeo speaks of her, he frequently employs imagery associated with religious worship and divine adoration, depicting her as a saint-like figure beyond his reach.

However, when it is mentioned during the Capulet household party that Rosaline, who Romeo is infatuated with, will not be attending, Romeo remarks:

> What lady's that which doth enrich the hand / Of yonder knight?

He appears not so deeply affected here when he learns it is Juliet as he often appears in his prior lamentations regarding Rosaline.