Act 2 begins with
"Now old desire doth in his death-bed lie,
And young affection gapes to be his heir;
That fair for which love groan'd for and would die,
With tender Juliet match'd, is now not fair."
The love Romeo had for Rosaline "old desire" is now gone. He has completely forgotten about her and how he felt for her. She has been replaced by Juliet. "Young affection" is now his love for Juliet. The "love groan'd for and would die" again refers to Rosaline and her beauty compared to Juliet's is the "is now not fair." He has realized that Rosaline was nothing to cry over. Juliet is everything to him now.
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