Demi Lovato and Selena Gomez have already had a major falling out once in their friendship, and it looks like it has happened again. The "Really Don't Care" singer recently appeared on Bravo's Watch What Happens Live and explained the real reason why she unfollowed Selena on Twitter — according to Demi, they've grown apart.

"I think it's just one of those things where people change and people grow apart," she spilled.

While there has been tons of speculation regarding the girls' friendship, we're completely heartbroken to hear Demi confirm what we were so desperately hoping to be a false. While it's unclear what actually happened between the girls, Demi made it known that she's not a fan of Justin Bieber during the same show.

When the host Andy Cohen asked Demi who she would "[Date], Marry, or Kill" with Justin, Joe Jonas, and Simon Cowell as her options, she immediately said she'd "kill Bieber." Ouch. Maybe Demi's tired of Selena being so indecisive about her relationship with Justin and decided to cut ties with her all together?

While no one knows what's really going on, we're confident that Demi and Selena will become BFFs again. After all, they've been able to work through rough patches in the past.

Click through to see a timeline of the girls' rocky friendship, then let us know in the comments below if you're sad that they've grown apart. Do you think they'll ever be friends again?