Former Mayor Rudy Giuliani on Friday said “it breaks my heart” to watch how the city’s quality of life has plummeted under current Mayor Bill de Blasio.

“Fox & Friends” host Ainsley Earhardt started the ball rolling, telling Giuliani, ”I’m a Christian. I love everyone, and I love him, but I don’t like what he’s doing for this city and that worries me. When I moved here everyone said you cleaned up Times Square. I don’t want it to go back to that. How do you feel about Mayor de Blasio and the direction of this great city?”

“It breaks my heart,” a somber-looking Giuliani responded without hesitation.

“I worked tirelessly to do that. A lot of my friends told me I couldn’t do it. A lot of my friends told me​​ I was crazy to run for mayor.

“I think this is an exceptional city,” Giuliani said. “There is none like it in the world, and to see this man break down not only what I did — but what Bloomberg did — I mean Bloomberg and I don’t see eye on eye on politics, but I thought he was a very good mayor.”

Giuliani, who was widely credited for cleaning up a drugs-and-prostitution-ridden Times Square in the 1990s, took particular issue with de Blasio for allowing city homelessness to rise to record levels over the past few years.

“Homelessness was gone, and homelessness should be gone,” Giuliani said. “There’s a way to look at homelessness that these liberals just don’t get.

“When I see a city with homeless people, I see a city with a mayor who doesn’t give a damn about people, because if you give a damn about people, you don’t let them lay on the street.

“I had a rule that streets were not for living,” added Giuliani, who ordered cops to tell vagrants they couldn’t sleep on the street and direct them to homeless shelters.

The ex-mayor took extra exception when host Brian Kilmeade reminded him of de Blasio’s repeated claim that he’s made the Big Apple “better.”

“Ha!” Giuliani quipped. “He must be smoking something. Gee, I wonder what that might be? That could be part of the problem.”

De Blasio, who has come under fire over a Post report that he logged a mere seven hours at City Hall in May, is expected to flee the city again later Friday to continue his quixotic presidential campaign. He’s slated to make stops in New Hampshire and Puerto Rico before returning to New York on Monday night.

The mayor’s office did not immediately respond to a request for comment.