The musician is rumoured to be dating successful tennis player Victoria Azarenka, but he suggested the relationship is in trouble during his appearance on Australia's The X Factor on Monday (29Jul13).
The star, who is a judge on the show, became tearful while listening to a wannabe perform an original track called Don't Let Me Go, and he spoke about his romance woes when addressing the 14-year-old singer.
He said, "I'm going through something right now in a relationship. And those lyrics made me cry. I wish I could show this to her now."