Demi Lovato has lost all respect for ex-boyfriend Joe Jonas

The teen star — who split from the Jonas Brothers rocker earlier this year — says she’s furious that Joe bought his new girlfriend on tour with them. “You know, I don’t have advice for anybody on that. You gotta brush it off,” said Lovato, who’s a special guest on the Jonas Brothers’ Live in Concert tour.

“I think there’s a certain level of respect that’s lost when that happens, but you can’t do anything about it other than to just keep going and be glad you have someone in your life that you can think about and spend your time with.”

Demi recently hinted that Joe broke her heart.

“My big fear is falling for someone that you love more than they love you,” she said.

“Boys are so easy to fall in love with and they break your heart!

“That’s what happened to me last year, I got my heart broken by a guy.

“I was in South America working and was devastated for a week — like crying my eyes out. I even cried on stage.

“I tried getting back together with him even though he really hurt me, but in the end we both knew it was over as it just wasn’t working.”