So, my girlfriend and I just broke up. Coincidentally, or maybe because April is just a shitty month, the inverse happened to Camille Standen, who wrote a piece for Noisey about how her shattered relationship ruined all the songs she used to love.
I can relate, but I wouldn't say my favorite songs have been ruined. Hearing The Temptations sing "My Girl" -- with that lyric, "I've even got the month of May" -- just fucking tore me up, but otherwise I seem to be okay, and the music in my rotation hasn't changed much.
Music is always sweeter at two points in a relationship: The start and finish. When you first meet, it's like rediscovering The Velvet Underground, and when you break up, it's like rediscovering what The Velvet Underground actually sang about. Who loves the motherfucking sun, indeed.