'RHONYC' Star Ramona Singer's Worst Nightmare! Love Rat Hubby Mario Reportedly Carrying On Affair With Mistress

Although Ramona Singer has reportedly taken back her love rat husband Mario, after filing for divorce in January, a new magazine report claims he’s still carrying on an alleged affair with 32-year-old fitness professional Kasey Dexter.

While Mario has moved back into the family home, In Touch reports he’s still gaga over Dexter -- and even set up a secret rendezvous with his mistress.

“He hasn’t been careful about the affair,” the insider told the magazine, who obtained a number of passionate text messages sent by Mario.

“Baby, U look so hot. I want u. Be a good girl. Xoxo,” Mario texted Dexter, according to the magazine.

Mario reportedly reunited with Dexter in Boca Raton, Fla., while the Real Housewives of New York City star was away on a ski vacation with pals in Aspen, Colo., and the pair continued to sneak around when they returned to New York.

“He and Kasey checked into The Bentley Hotel, and then went for a romantic dinner together,” the insider claimed.

The Mario-Dexter relationship took a turn for the scary earlier this year, when Ramona caught her husband fooling around with the toned trainer at the family’s Hamptons home, leading to an incident that saw police being called and later, divorce papers being drawn up.

Since filing for divorce, Ramona has taken back her hubby, tweeting a photo of the smiling couple with the caption: “What doesn’t break you makes you stronger.”