Carey and Tanaka, whose romance was documented on her E! reality series, Mariah's World, split in April, after a source said Tanaka started to get "jealous" over the pop diva's close relationship with her ex-husband, Nick Cannon.
In an interview with ET earlier this month, Carey said she and Cannon are "together when it counts."
"We're together for the kids. And I think that's the most important thing,” she explained.
“It's so perfect right now. Honestly, I'm working on being the best me that I can possibly be, and from that, I'm working on being the best father that I can be, and that's a plate full right there," Cannon added. "I love her, I adore her, that's always going to be my dream girl, but I think, as mature adults, I think we just operate better with the way things are right now.”