I thought I'd make a new topic for this seeing this type of song changes frequently for most people.
The song stuck in my head at the moment is
Sometime Around Midnight by Toxic Airbourne Event
Listen - http://listen.grooveshark.com/#/song/Sometime_Around_Midnight/20934795
Bizarre band name I know, but I find the song really good.
It's so fitting because it's about a guy who still has feelings for his ex, and well, I can't stop thinking about the girl I recently broke up with after 3 years relationship.