Ramona Singer Files for Divorce from Husband; Did He Cheat?

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Ramona Singer has filed for divorce from Mario Singer.

As previously detailed, the reality star walked in on her husband with another woman last week, leading to a domestic dispute in which police were called to the couple's Hamptons' home, although no charges were filed.

It was initially reported that the Singers separated back in October and each were now seeing someone new.

However, sources now say Mario was cheating on Ramona and that's why the argument escalated Friday night.

The Real Housewives of New York City cast members has not publicly confirmed on the situation, only referring to it as "a personal and private matter for our family" and asking for "privacy during this difficult time" in a statement yesterday.

Jill Zarin, though, is happy to call out Mario.

"Ramona has been protecting him," Zarin tells People. "She looked the other way when people told her he was cheating."

Now, sadly, it looks like Singer has no choice but to look the truth in the eye.

Season 6 of The Real Housewives of New York City kicks off March 11 on Bravo.