'It Really Doesn't Matter What He Thinks': 'RHONY' Star Ramona Singer Doesn't Care How Cheater Ex Mario Responds To Her Bombshell Book

Ramona Singer said she's kept her distance from her cheating ex Mario -- and doesn't care about his opinions any longer.

The Real Housewives of New York beauty, appearing on Watch What Happens Live Tuesday, was asked by a caller how he reacted to her bombshell memoir, Life on the Ramona Coaster.

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"My ex-husband hasn't really read the book, he's just seen some things that have been printed on the internet," the reality star said. "We're really not speaking.

"And you know what, it really doesn't matter what he thinks, he's my ex-husband and I have a new life."

The fiery celeb clarified to host Andy Cohen that she's "just about" finalized her divorce from the cheater.

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Elsewhere on the show, Ramona stressed that she was remorseful of how she blamed Countess LuAnn de Lesseps over the hijinks that took place during the cast's ill-fated Turks & Caicos trip.

"I was sincere: I woke up in the morning and I was really tired," she recalled. "It was our last day at the villa, we had been up all night until early in the morning, and I just passed the buck to LuAnn because I didn't want to deal with Heather -- cause Heather was just going nuts!

"And I shouldn't have done that, it was wrong of me."

Life on the Ramona Coaster is in stores now.