Two lines from two Taking Back Sunday songs, of the angry-emo-punkish genre:
Head Club: "I'm sick of writing every song about you"
Great Romances of the 21st Century: "If it's not keeping you up nights, then what's the point?"
I've never come across anything that so thoroughly encapsulates the "I'm mad you left me and going to whine about it" p.o.v.
Any Dashboard Confessional line ever works for the "I'm Sad you left me and going to whine about it" p.o.v.
See "Saints and Sailors":
"And I'm throwing away the letters that I am writing you
Cause they would never do,
I would never do."
Here we are now
Entertain us
I feel stupid and contagious
Here we are now
Entertain us"
Sums up the generation that created it, and the genre it created.