The singer gave birth to son Halo last year.
#OnMyMind aims to support and improve the mental health of youth around the world.
"Before I went onstage, I would be crying half the time," the rapper said in a new interview.
The star also reflected on her My Mind & Me documentary at a SXSW panel.
The couple briefly split in 2016, but reconciled shortly after.
Also this week: iHeartMedia strikes a collab with Zigazoo Kids, two indie radio promotions firms merge and more.
"After taking a hard look at where I am and where I was going, I need to pull myself back and be home with my family for the time being," the Slipknot artist wrote in his statement.
The singer also said that the "Barbie" song came at a time when she was in a "dark episode" in her life.
"I know if I really slow down and listen when I'm low there’s always something to hear," he wrote on Instagram.
The K-pop star said having a large social media following makes her feel vulnerable, particularly when people are critical.
