"Tame and I are no longer together," she wrote.
"Our love was so real and for seven months we were really happy. But once trust is broken, it's hard to get it back. I have myself, my son and my music to think about.
"So I made the hardest decision I've ever had to make, and ended it. I want nothing but happiness and success for Tame and wish him all the best, with hopes that maybe one day down the track we can be good friends again."
She thanked her fans for their support.
A second season of The GC is yet to be confirmed. The GC - a reality TV show in the style of Jersey Shore - attracted criticism after being partially funded by NZ on Air, and for its lack of Maori culture, which featured heavily in its funding application.
- Herald online with Herald on Sunday