Speaking in the episode, Carey said she had turned her heartbreak into a song.
"Ever since the tour wrapped I took some time just to process my feelings, and I started writing a song to express what I've been going through," she said.
Carey and Packer split after a whirlwind romance (and lots of PDA), with Carey keeping the $10 million engagement ring Packer gave her when he proposed.
In November, Carey told The Ellen DeGeneres Show she was philosophical about the split.
"Everything happens for a reason. Things are the way they are," she said.
Carey is now dating her back-up dancer Bryan Tanaka, with the couple sharing a kiss in the Mariah's World finale.