Probably what led to the breakup in the first place!
This wasn't a breakup, but waaay back when I was a freshman in high school, I became seriously infatuated with a girl in one of my classes, and spent the entire weekend listening to "Forever Young" (Alphaville, not Rod Stewart.) By Monday, I was completely over her. She was still very nice, and VERY pretty, mind you, but the spell was broken...or the illness had run its course...
[edit] Of course, there's always this heartfelt classic:
One More Minute
(Sorry, for some reason I can't embed from my tablet.)