“Demi Lovato’s apparent opioid overdose and subsequent hospitalization on Tuesday has left longtime friends “shocked” and “reeling,” but some close to the 25-year-old singer have noticed that all has not been well with her.

“Sources tell PEOPLE that Lovato has been “a total mess for months,” and some point to her new perspective on sobriety and a subsequent split with Mike Bayer, her longtime life coach, as a major red flag.

““Demi began to feel that the belief that total abstinence is the only way to deal with addiction is false,” a source with insider knowledge of the situation tells PEOPLE.”

Read more at People