One thing that is certain is that Ariana misses Mac (real name Malcolm) everyday, and since his death has posted various tributes to him.
Now, a fan has unearthed an old video of Malcolm holding a live-stream on Instagram, while listening to Ariana's song "R.E.M".
At the time, it had yet to be released.
Ariana responded in a series of tweets, thanking the fan by saying, “His voice and laugh. thank u for finding this. he is supposed to be here.”
Ariana most recently honoured Malcolm again in her newest song, "thank u, next," where she sings, "Wish I could say thank you to Malcolm, 'cause he was an angel."