I always liked Guns N Roses 'I used to love her, but I had to kill her'
Mr Big made the list with "Be With You" but some on the panel noted that the song was about waiting in line for a prostitute, so technically, Mr. Big's song was actually the best bad love song.
...and I can still hear her complain!
Try: http://cocaine.org/cocaineblues-johnnycash.html
Early one mornin' while makin' the rounds
I took a shot of cocaine and I shot my woman down
I went right home and I went to bed
I stuck that lovin' 44 beneath my head