The singer and the reality TV star - who had been dating for almost two years - have decided to call time on their relationship because they couldn't agree on their future.
A source told Life & Style magazine: "They decided to end their relationship. It wasn't working out, and they wanted to go their separate ways.
"She wanted to settle down, but he wasn't exactly ready. They had been having problems starting in the summer with her tour because she was on the road all the time. It put a strain on their relationship."
The 27-year-old star said: "It's all about love and I make that my number one priority. One day I would hope to have kids and do that whole thing. Right now I'm very focused on my career, my album, my tour and naturally when that happens for me next, yeah I'll go for it."