Real Housewives of New York star Ramona Singer will soon be a single woman, and it looks as though her hubby Mario, whose affair allegedly drove them apart, is following suit.

60-year-old Mario, whose reported dalliance with 32-year-old Kasey Dexter put the nail in the coffin of his 27-year marriage, is already moving on, according to Star (via RadarOnline.com).

“Mario had been seeing Kasey behind Ramona’s back for eight months and was giving her the usual line that he’d marry her after he left his wife,” an insider reveals.

However, once the news of Mario’s new relationship broke, he quickly did a 180, although it was too late — Ramona had already filed for divorce.

“After the affair blew up in public, he blindsided Kasey by cutting off all communication with her,” says Star’s source.

While Ramona seemed to be blindsided by the news of her husband’s infidelity, her former RHONY castmate, Jill Zarin, revealed that Mario’s cheating was the worst-kept secret in Manhattan.

“Ramona has been protecting him,” Jill told People. “She looked the other way when people told her he was cheating.”

Do you think Ramona and Mario can salvage their marriage, or are they done for good?

Source: Star / RadarOnline.com