*headdesk* I can't believe I didn't think of this song before. "Petals" by Mariah Carey always makes me think of the Doctor and Rose and the following verse makes me think of the Doctor, Rose and Jack:

A boy and a girl befriended me
We're bonded through despondency
I stayed so long but finally
I fled to save my sanity

I don't know....you might not think it fits, but it does for me....Hmm... lol