Selena Gomez is in a “free fall,” a source close to the singer, 24, tells In Touch exclusively, and her break up from Justin Bieber is at fault for her problems.

The source says, “Her problems are a combination of drinking, partying and her lupus.”

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Earlier this summer, Sel decided to cancel her Revival Tour — and the insider says she reached her breaking point when she saw pics of Justin, 22, and his new girlfriend Sofia Richie, 18.

“Selena had a meltdown,” the source adds. While Justin tried his best to ignore her, that only made things worse.

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Justin and his new girlfriend, Sofia.

Now, he and his family are hoping the former Disney Channel star gets the aid she so desperately needs.

“Justin and his family are praying that she gets the help she needs,” a source close to JB tells the magazine. “They just want Selena to get well.”

For more on Selena’s downward spiral, pick up the new issue of In Touch, on newsstands now.