Then this week, Frankie told Us Weekly that he and his boyfriend recently went on a "really fun" double date with Ariana and Mikey, and called Ariana's rumoured boyfriend "really sweet, kind, and caring".
But it turns out it's not that simple after all, because on Thursday — in a now-deleted tweet — Frankie said Ariana is "not in a relationship" and is, in fact, "very much single".
He also gave a further statement to Us Weekly, saying Ariana and Mikey are "not in an official relationship".
So, I guess Mikey really ain't Ariana's boyfriend after all.
Ellie Bate is a celebrity reporter and talent coordinator at BuzzFeed UK and is based in London.