Selena GomezandDemi Lovatohave hadtheir ups and downsthrough the years since first becoming friends at just 6 years old, but the stars will always have each other backs no matter what.

Lovato, 25, is currently still recovering in a Los Angeles hospital but is “awake and talking,” a source previously told PEOPLE. While TMZ initially reported the overdose was heroin-related, multiple sources close to Lovato claimed to PEOPLE that it was not.

Lovato hasbattled addiction, mental illness and disordered eatingfor years. In 2010, she entered treatment, where she was treated for bipolar disorder, bulimia, self-harm and addiction. She relapsed after she left the treatment center, then entered a sober living facility for a year.

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“Demi reached out whenSelena had her kidney transplant. They will always care a lot for each other and Selena will be there for her friend,” adds the Gomez source.

Last fall, the former Disney darlings reunited at the InStyle Awards where they hugged on the red carpet and were seen catching up inside.

Lovato gushed about Gomez’s single “Fetish” before her pal returned the social media love a couple months later after watching Lovato’s candid and emotionalYouTube documentarySimply Complicated. “This was beautiful,” Gomez commented on Lovato’s Instagram post. “I’m so happy for you. You always continue to be bold and real. I wish more people were like you. Love you.”

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In March, Lovato revealed shecelebrated six years of sobriety, but just three months later released a new song, “Sober,” andrevealed that she had relapsed.

“Mama, I’m so sorry I’m not sober anymore / And daddy please forgive me for the drinks spilled on the floor,” she sang on the heartbreaking piano ballad. “And I’m sorry for the fans I lost who watched me fall again / I wanna be a role model, but I’m only human.”

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

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“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 told PEOPLE.

“She essentially said that she felt it wasn’t the only way and that she can handle her addictions, and she would rather attempt controlled consumption,” added the insider. “She felt that she could drink in moderation and she believed she wouldn’t return to harder drug use, and that alcohol was never really a problem as much as other things.”

If you or someone you know is in need of help, please contact theSAMHSA substance abuse helplineat 1-800-662-HELP.

source: people.com