Have you ever listened to OutKast's song Hey Ya? I'm sure you've heard it it; otherwise you spent 2003 under a rock with earplugs in. But I mean have you ever truly listened to it?
The upbeat rhythm and the hook (which is more contagious than syphilis) belittle the meaning behind the lyrics.
The words in the song very explicitly tell a story of a protagonist who feels insecure about his current relationship. CORRECTION: He is secure in his relationship to the end that he knows his woman is not cheating on him, but he feels her lack of infidelity is not for lack of desire, but merely a fear of destroying the comfortable relationship that has become the status quo.
As the song progresses our protagonist searches in vain to understand why two people stay together when they clearly are not happy with one another.
The best answer I can think of is that most people would rather be unhappy with someone else than be solely responsible for their own happiness.
How terribly depressing...