Help Finding a Song

I am attending a workshop in which we are studying Romeo and Juliet. I was asked to find a song to represent the emotions and feelings in this monologue:

FRIAR LAURENCE
Holy Saint Francis, what a change is here!
Is Rosaline, whom thou didst love so dear,
So soon forsaken? young men's love then lies
Not truly in their hearts, but in their eyes.
Jesu Maria, what a deal of brine
Hath wash'd thy sallow cheeks for Rosaline!
How much salt water thrown away in waste,
To season love, that of it doth not taste!
The sun not yet thy sighs from heaven clears,
Thy old groans ring yet in my ancient ears;
Lo, here upon thy cheek the stain doth sit
Of an old tear that is not wash'd off yet:
If e'er thou wast thyself and these woes thine,
Thou and these woes were all for Rosaline:
And art thou changed? pronounce this sentence then,
Women may fall, when there's no strength in men.


Does anyone have any ideas? (I'd like a song from a musical.)

How does What I Did For Love fit?

Maybe Agony (Reprise) from Into the Woods? That's got the same sort of feeling of suddenly losing one's love for one person and transfering it quickly to another.