Jason Derulo just won't shut up about his split with Jordin Sparks

During an interview with Power 105.1's DJ Envy, the "Ridin' Solo" singer says that their relationship simply ran it's course ... and admits he broke up with her over the phone!

"Every relationship has their ups and downs and you know, when you start having more downs than ups, you gotta take a look at your relationship and be like, 'Is this something that I'm supposed to be doing?'" he said.

When asked how he broke things off, Derulo admitted he did it "over the phone" because he "wasn't in town."

The 25-year-old continued to spill details about their relationship, insisting that the couple's sex life was not a factor in the split. "It wasn't a problem in that area at all," he said. "Yeah [our sex life was fine]."

Sparks also opened up about the break up, telling "Today's" Hoda Kotb and Kathie Lee Gifford that she's staying positive.

"I'm good, actually...I read this quote [yesterday], and it said, 'When something unexpected happens in your life, or you think something bad happens, just say 'Plot twist!' and move on,'" she declared.

The "American Idol" alum later told Wendy Williams that she will return the BMW she was gifted by now-ex-boyfriend, but refused to comment on cheating allegations.

Check out the clip above to hear from Jason -- at least it wasn't via text!