According to Us Weekly, the middle Jonas Brother and Lovato have decided to end their relationship after going public with their romance in March.
A source is quoted as claiming that the pair broke up in a phone call, but suggested there is still hope they will reunite in the future.
"They are so young," the insider said. "I wouldn't count them out yet."
The duo will reportedly still hit the road together later this year when Lovato will open for the Jonas Brothers at venues across the US.
It was recently reported that Jonas, 20, and 17-year-old Lovato were "slowing down" their romance and that Jonas "doesn't like everyone knowing everything" about their relationship.
Jonas and Lovato have yet to comment.