Ramona Singer’s husband, Mario, swore he and his mistress, Kasey Dexter, were over when the RHONYC star decided to take him back in March — but a photo obtained by In Touch proves that the affair is anything but finished!

“She threw Mario out in late July because she discovered he was back with his mistress,” a source exclusively reveals to In Touch.

EXCLUSIVE: Read the Shocking Letter to Ramona Singer From Her Husband’s Mistress!

But Mario isn’t exactly hurting over it. On July 27, Mario and Kasey were seen strolling hand in hand and kissing in Montauk on Long Island. The following week, they were snapped in a photo exclusive to In Touch at an Aug. 2 brunch outing at NYC’s Anassa Taverna.

That same day, Ramona changed her cover photo on Facebook from a picture of her, Mario and daughter Avery,19, to a shot of just her and Avery. “Once again,” the source tells In Touch, “Mario made a fool out of Ramona.”

Have a tip? Send it to us! Email In Touch at contact@intouchweekly.com.