Selena Gomez thought Justin Bieber may have given her a sexually transmitted disease before she allegedly entered rehab for her rumored lupus disease, HollywoodLife.com reports.

"Selena has had issues with anxiety for a while," an inside source told the website.

"And she's still dealing with them. It started when Justin was cheating on her - one big breaking point was that she thought he gave her an STD and got tested."

There is no confirmation whether the "Slow Down" singer has either lupus or a sexually transmitted disease.

Selena Gomez posted a photo of herself hugging a close friend after being released from rehabilitation, leaving some fans wondering if she released them to prove to her fans that she is struggling with lupus disease and not her rumored substance abuse.

"Just stoked you were born dude," she captioned the photo.

She also posted another photo on the same day with the caption: "I've done everything I could to the best of my ability," she captioned the photo.

"Thank you for the unconditional love and cyber hugs. You inspire me."

Selena Gomez's camp says she doesn't have serious issues with addiction and/or Justin Bieber, and that her rehab trip was mostly due to being "burned out," TheHollywoodGossip.com reports.

Justin Bieber is allegedly laughing at Selena Gomez's claims that he is a "bad influence" because he says she's always the drunk at the party, TMZ reports.

Selena Gomez posted a video of herself practicing a dance routine with some of her backup dancers, giving many the impression it is her way of recovering after rumors surfaced of her going to rehab because of Justin Bieber's wild ways.

The "Slow Down" singer revealed she voluntarily spent time at The Meadows recovery center in Arizona in January for two weeks, the New York Daily News reports.

"Selena voluntarily spent time at Meadows but not for substance abuse," her rep said in a statement, the New York Daily News also reports.