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Patti Stanger: “I Was There That Night Mario Singer Cheated” on Ramona

Patti Stanger
Patti Stanger told WWHL host Andy Cohen that she witnessed Real Housewives of New York star Mario Singer's alleged infidelity firsthand; "I was worried for Ramona," she shared

Caught in the act! Patti Stanger inadvertently snagged a front-row seat to the downfall of Ramona and Mario Singer‘s 22-year marriage when she witnessed him hitting on another woman at a party in the Hamptons back in 2013.

Appearing on Watch What Happens Live on Thursday, March 26, the Millionaire Matchmaker star told host Andy Cohen that she saw Mario’s alleged infidelity firsthand. (Real Housewives of New York City veteran Ramona split from her now-ex last August amid ongoing rumors that he was carrying on an affair with young socialite Kasey Dexter.) 

Related: PHOTOS: Hellish Housewives romances

“I was there that night he cheated,” Stanger, 53, dished. “Me and Jill [Zarin], in the Hamptons. I saw the whole thing go down.”

Initially, she said, she wondered whether Mario and Ramona had an arrangement or an open marriage. “I kinda thought they swung a little. I wasn’t sure,” she explained. “It had a little connotation like that.”

mario and ramona singer
Ramona Singer and Mario Singer attend an event on April 2, 2014 in New York City

Related: PHOTOS: Biggest cheating scandals ever

Ultimately, though, she realized what was happening. “I saw the whole thing. I saw him pick the girl at a certain person’s house — you probably know,” she told Cohen. “It was a big dinner party, and we just came for dessert, and I watched this and I was, like, sober, and everybody else wasn’t. And I went, ‘What is going on here?'”

She continued: “And then I was worried for Ramona. I was really worried for her. Because I saw shades of him trying — he had like a midlife crisis going on. And she doesn’t deserve that. She’s a great girl.”

Related: PHOTOS: Before they were Real Housewives

Ramona and Mario — who share daughter Avery, 20 — first separated in January 2014, a few months after reports surfaced of his alleged cheating. They reconciled a few weeks later and sought therapy, but then split for good in August.

“We were working very hard on our relationship and making great progress,” Ramona told Us at the time. “It was really working well, and then I got the feeling that he started seeing [Kasey] again.”

Related: PHOTOS: Housewives husbands hall of fame

That feeling turned out to be right, so she kicked him out and left a note telling him to get his own place. “I would never reconcile with him,” she told Us. “I believe in marriage, I gave him a second chance, and he betrayed me and our daughter. You just don’t do that.”

Ramona is now learning to adjust to her new life as a single mom, and if the season seven preview for RHONY is any indication, it’s going to take time. A snippet from an upcoming episode showed the reality star sobbing into a pal’s arms, saying, “My marriage is down the tube, and in a million years, I never thought this would happen.”

Season seven of RHONY premieres on Tuesday, April 7, at 9 p.m. on Bravo.

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