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, leaving fans wondering if it could have led to the couple's split.

"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 a sexually transmitted disease.

Justin Bieber responded to a Twitter post mentioning that he changed his name to "Bizzle" and seemed to insinuate it was only temporary.

"Justin's name on Instagram and Shots is now 'Bizzle,'" a fan tweeted.

"for now," Justin Bieber responded.

After he changed his Instagram name to Bizzle on Saturday - it left his fans wondering if he's abandoning pop to pursue a hip-hop career as a rapper.

Selena Gomez's ex-boyfriend was spotted recording music in the studio with hip-hop star T.I. on the same night he changed his name.

Justin Bieber is rumored to be getting into a serious relationship with singer Katherine Gazda, HollywoodLife.com reports, leaving many fans wondering if he's considering retiring with her.

The newly formed couple met and began dating in late 2013 - around the same time he revealed he would be retiring from music.

Justin Bieber was spotted partying with P-Diddy in an Atlanta nightclub earlier this week, but something was noticeably different - the "All That Matters" singer was not smoking marijuana (as his entourage was) and was only drinking soft drinks.

Many fans receiving news of the teen heartthrob's night out came to the conclusion he may be taking a break from controlled substances for his ex-girlfriend Selena Gomez.