She dropped her new track with Justin Bieber, Stuck with U, just last week.And Ariana Grande discussed the COVID-19 fundraiser track, as well as her late ex Mac Miller and her 'diva' reputation when she joined Zane Lowe on Apple Music to run through her At Home With playlist on Wednesday.Of Miller, who passed away in 2018, she said, 'I think that nothing mattered more to him than music ever.' An open book: Ariana Grande discussed the COVID-19 fundraiser track, as well as her late ex Mac Miller and her 'diva' reputation when she joined Zane Lowe on Apple Music to run through her At Home With playlist on WednesdayThe Thank U, Next hitmaker, who dated Miller for nearly two years between 2016 and 2018, said, 'He was the kind of person who woke.