Some lyrics make very little grammatical sense, but looking past that it's actually pretty decent lyrically. It's pretty clearly a "breakup" song of some sort, but I'm not sure it's necessarily about a partner. I think this song is about Ariana's distancing from her Nickoldeon past, and her search to find herself as a more 'mature' artist. Some have also said it's about the illuminati! I don't usually give those theories much weight but this song does have some interesting symbology.