EXCLUSIVE: Ramona Singer Says Luann de Lesseps Forgave Fiance's Cheating Too Fast

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On Wednesday night’s Real Housewives of New York finale, Luann de Lesseps learned her fiancé, Tom D’Agostino, Jr., had kissed another woman in a hotel bar just days after proposing to her. It was an emotional episode to say the least, but it also showed de Lesseps telling cameras she was staying with D’Agostino after his indiscretion. Her friend and co-star Ramona Singer tells ET Luann forgave too much too fast.

“I think she should have given him the cold shoulder longer than one night,” she says. “In fact, I don't think she even gave him the cold shoulder one night.” Singer was a major part of de Lesseps and D’Agostino’s storyline this season; both she and Sonja Morgan said they’d been romantically involved with D’Agostino in the past, and claimed he wasn’t being honest with de Lesseps about the nature of the relationships.

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“I said this to Luann on the reunion… this is with anybody in life… if someone can't tell the truth, that's a red flag,” she says. “If he couldn't tell the truth about his relationships with Sonya and me, that's a red flag and that makes me nervous. That makes me nervous for Luann... I just find it beyond baffling that he couldn't tell the truth about his relationships.”

Singer says D’Agostino lied to de Lesseps about how many times he went out on dates with Singer – and she just doesn’t understand why. She says she had discussions with de Lesseps during the season that viewers didn’t see. “I said to Luann, ‘I want you to know, they are asking me the question when I get into the interview chair, like, how many times did you date Tom?’” she says. “I said, ‘I want you to know I said six times,’ and she said, ‘Why did you lie? It was only once.’”

“I am not lying,” she continues. “He lied to her and I don't understand why. There is no reason to lie.”

De Lesseps is standing by her man. “I'm not going to let a silly kiss ruin the rest of our lives,” she tells ET. “This is the most exciting time of my life, getting married again after all this time. I am thrilled. I am not going to let what has happened on the show ruin the most exciting time of my life.”

We’ll see more drama go down during the RHONY reunion specials; part one premieres August 31 on Bravo. To hear why the reunion might mean Bethenny Frankel won’t be returning to the show, watch the video below!