Kelly Bensimon found out the man she’s been dating was locking lips with someone else just an hour before she walked the runway in a bikini for Miami Swim Week.

A source tells us that the former “Real Housewives of New York” star was backstage at designer Melissa Odabash’s show, “sitting in hair and makeup and she got a text,” that the man she has been dating, financier Robert Flood, was allegedly locking lips with his former fiancée at a bar in Westchester, NY.

A spy tells us that, “people were saying to her, ‘Don’t let this psych you out,'” before she strutted the catwalk in a two-piece suit to open the show last weekend.

We hear that Bensimon confronted Flood — who also briefly dated Tiger Wood’s former mistress Rachel Uchitel — a few days later,and is now trying to figure out what t

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