.....you're sitting musing on the potential myriad benefits of divorce?
You could have it so much better - Franz Ferdinand
Seriously, it's not helping 
Also, 'Foundations' by Kate Nash when I was considering calling off my engagement to a right twat whom I still dearly loved for some reason. Right song, right time, really depressing evening. Reader, I didn't marry him.
Tell me of songs that have made you wince at their appropriateness, please!