In the ballad, Cyrus croons, "This is my sad Christmas song/I've had it stuck in my head all day long/I wrote it in the car on my ride home/Because I knew I'd walk in the door and I'd be alone."
Cyrus then questions why she put up a Christmas tree and even admits that her sister called her a grinch.
Later, the singer reveals the source of her sadness. "Next year I'm gonna be with my man," she sings, before adding, "Why did you have to go? We were under the mistletoe."
In August, Cyrus revealed she was single. "I'm pansexual. But I'm not in a relationship," she told Elle UK back then. "I'm going on dates, but I change my style every two weeks, let alone who I'm with."