Six months after announcing their engagement, Jason Mraz has split from his fiancée, 29-year-old singer-songwriter Tristan Prettyman.

The 33-year-old 'I'm Yours' singer revealed the news to The Daily Beast at the Samsung Hope for Children gala on Tuesday night. "My greatest mistake right now is, I've been clinging to my art," he said. "In that, I have victory for my art and a great loss for my heart. At the moment, my beautiful fiancée is no longer my beautiful fiancée."

Mraz proposed to his on-again-off-again girlfriend in December, tweeting "SHE SAID YES" on Christmas Eve. However, the couple had no plans to wed until marriage became legal for everyone.

"We can't get married until [gay] marriage is legal and equal," Mraz told Us Weekly in January. "I think giving people the right to marry will be a huge movement in civil rights."

As for the reason behind their breakup, Mraz said, "Two halves don't make a whole, two wholes make a whole. In my relationship, I was giving myself away to make the relationship better, but in actuality, wasn't doing better by doing that. I became less of a man."

For now, the split is amicable. "We are still super friends, we go to yoga together, we surf together," Mraz said. "We acknowledge the journey that each of us is on. We certainly want each of us to feel whole and complete. And it's when you're whole and complete that that attraction exists and it really thrives."

Watch Jason Mraz and Tristan Prettyman Perform 'Shy That Way' Live