Dea, 49, confirmed the news to the Herald Sun on Friday, claiming she was "blindsided" by "the action" of the ex-AFL star, 37.
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Dea said: "This is a very difficult time for me and my girls. We have been blindsided and left devastated by Darren’s action.
"But I'm focusing on my two daughters who are my number one priority. Please respect our privacy while we move on."
The Block's Dea and Darren Jolly have split
Nine
The Block couple from Melbourne, who are affectionately known as Daz and Dea, were known for their constant bickering.
They appeared on two seasons of The Block — 2014's Glasshouse and then again in 2015's Triple Threat.
In 2015, they made $835,000 profit and then earned an additional $100,000 for winning the series, bringing their total to $935,000, winning the most prize money out of any Block team.