Demi Lovato has reportedly ended her friendship with pop star Selena Gomez. Rumors surfaced that there was a feud between the two singers when Lovato reportedly posted an angry tweet shortly before unfollowing Gomez on Twitter.

According to Hollywood Life, Lovato posted (and deleted), "Swimming away from the bulls**t bye b**ch."

A source told the site, "Demi doesn't need any extra drama, she's learned from her own recovery to lose the people that bring her down and Selena is too much of a headache."

The "Heart Attack" singer has admitted in the past that she and Gomez had hit a few rough patches in their friendship.

"We've been through a lot together, we've had periods of times we here we grew apart and we just didn't really talk," she said last year, according to Daily Mail.

"Now we are in a place where I think we realized that life is so short and that when you have people in your life that love you so much then, you should just always be around them," Lovato added. "Everything about her, she has a great soul, she's talented, she's beautiful, and she will always be really, really close to my heart."

It was also rumored that Gomez had a falling out with Taylor Swift over her rekindled relationship with Justin Bieber. A source told Hollywood Life that the romance is driving a wedge between the 21-year-old singer and her pal.

"Taylor and Selena are still friends even though she went back to Justin," the source said. "But Taylor has set some boundaries which include no talking about Justin."

"Taylor really cares about Sel but she doesn't want to be an enabler when it comes to Justin," the source added. "Taylor has spent countless hours giving her support and advice but that's it. She will always be there for Sel but isn't giving any more advice on the matter. If Selena has any issues, Taylor suggested that she speak with a therapist because she doesn't want to get in the middle of it."