A source told ET that Carter was "extremely disappointed that he had to leave the facility" and told his inner circle that he will "continue working on his wellness, and after he handles these personal matters he will be figuring out exactly what that looks like."
"He was doing very well," the source shared. "He gained a significant amount of weight and was getting stronger by the day."
In September, Carter appeared on The Doctors -- the episode was filmed in August -- where he broke down in tears talking about his gaunt appearance and personal health. The musician also took a drug test, where he tested negative for both cocaine and meth. Though, Dr. Travis Stork did note that the combination of drugs that the singer did test positive for weren’t necessarily safe.
See more of his experience on the show in the video below.