At a point in the performance, Bieber called Ariana over to stand in front of him, and wrapped his arm around her waist.
Big Sean, who was apparently watching, showed his anger on Twitter.
Deleted tweet from Big Sean pic.twitter.com/e23iF2qj5L
— sɛⱥɴɪɑɴa Ǥʀⱥɴdє (@BIG_SEANIANA) April 9, 2015
Big Sean’s deleted tweet