So much to answer for...
Not a valentine song, or a new song, but this came on, and it still totally rules.
"Oh, John, you'll never be a man."
A very powerful (and controversial) song. If you don't know the back story, it's worth a look.
I'm reading Morrissey's autobiography, and he keeps mentioning Manchester (understandably) and so this has been in my head for like a week.