With Mel it was "Midnight Sun" by Duran Duran.
However this one.. the official song in my eyes is "I've been losing you" by A-ha. This apart of the healing process, apart of the closure for me emotionally-wise. I never delete songs that I come to recognize with someone that I once loved.. because the memories are as important to me as the closure.
But this is helping me to let go.. and I need that.