This mellow, guitar-driven track finds Chris Brown reflecting on a former girlfriend who is struggling to move on.
Don't check on me If we're not together, then it's probably for a reason Every heartbreak has its season It ain't always summer in June
The singer has cut his ties with his ex, so he doesn't want her calling him.
Justin Bieber takes the baton on the second verse with a similar message to his former girlfriend.
I'm distant 'cause I don't wanna be reached now Won't let the ghosts of our past weigh my future down
Bieber's relationship had been a toxic one. Now that he's over it, he doesn't want any reminders of his ex.
The emotionally charged ballad is the fifth in a long line of collaborations between Brown and Bieber, which started with 2011's "Up (Remix)," and "Next 2 You." The pair also worked together on "Actin' Up" and "Ladies Love Me."
"Don't Check on Me" was produced by Sheldon Ferguson and Atia "INK" Boggs. Ink also supplies some guest vocals.
"St. Elmo's Fire (Man In Motion)" was not written for the movie, but for Rick Hanson, a wheelchair athlete whose 1985 "Man In Motion" tour logged 24,856 miles on his wheelchair in 34 countries while raising $26 million for spinal cord research.