"I called her in the car as soon as my mam ye was like, you should do it. And then i called her and didn't propose," he said. "We were together for what idi' feel like to know you shouldn't do it." He says his ex-wife cheated on him with another man but that they are still friends. The actor is currently filming a new series of 'Carpool Karaoke', which premieres this week at 10 p.m. ET/PT on TLC.