Cheater Bill de Blasio blows up ‘lovely’ union with much younger lefty activist Nomiki Konst: sources

Line forms to the left, ladies.

Former NYC Mayor Bill de Blasio is back on the market after an alleged affair with an out-of-state elected official put the brakes on his 10-month relationship with progressive activist Nomiki Konst, two sources tell The Post.

The couple went public with their courtship in February with de Blasio, 64, saying at the time he and Konst, 41, were “kindred souls” who had known each other for a long time.

But 10 months later and the erstwhile happy couple is no more, with sources saying the former “The Young Turks” investigative reporter and Bernie Sanders campaign surrogate was left devastated after allegedly being two-timed by the former mayor.

“The way it all went down was even worse than what he f–king did. She was really, really happy, and then, when it happened, I was like ‘What!?’” said one source whom Konst confided in.

“She was so empathic, even though she was the victim, but he just kept hurting her. The problem was the public face aspect of it all. It was just horrible.”

The pair was spotted together sporting NYC mayor-elect Zohran Mamdani shirts at a No Kings protest Oct. 18, smiling broadly with their arm around each other.

Sources said the breakup, which happened sometime between then and Election Day, came about after Blaz struck up an affair with an elected official from out of state, whose identity is not yet known.

“Nomiki and I had a lovely relationship for 10 months, I have deep respect for her and what she stands for, and I hope we can have a real friendship in the future,” de Blasio told The Post.

“I don’t have anything else to add.”

De Blasio separated from his wife, Chirlane McCray, in 2023 but said they had no intention of divorcing.

They were seen together at an A-list event in March, despite the former mayor’s active dating life.

In September 2023, de Blasio was spotted indulging in a marathon make-out session with a mystery woman at the Upper West Side’s Empire Rooftop bar.

Three months later he was spied taking out another woman who was still married — but he appeared to have dropped both for Konst.

De Blasio just signed a contributor deal with CNN last month, and has been out in the public eye at events in support of Mamdani.

Konst was the architect behind rebranding the out-of-touch former mayor, helping him become relevant again and fixing his often-ridiculed hair coloring after leaving office.