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My wife was having an affair — but not with Nassau exec

The woman implicated in a “sexting” scandal with Nassau County Executive Ed Mangano is in the midst of divorcing her husband, who told The Post he suspects she may have been involved with a different man.

Karin Murphy Caro’s estranged husband didn’t identify the alleged other man beyond saying it wasn’t Mangano, a married father of two sons.

But Alexander Caro said Sunday that his soon-to-be ex, who runs a public relations firm called BluChip Marketing, did score no-bid contracts from Nassau County with Mangano’s help.

Karin Caro met Mangano through connections at the famed Oheka Castle, whose owner, Gary Melius, was shot in the face during a still-unsolved ambush there two years ago, Alexander told The Post.

“These were people I didn’t really want to do business with. And she went and got a contract without a public bid, which was a bad idea because they didn’t go through the normal bidding process,” he said. “How she was able to get it, I really don’t know, but it wasn’t right.”

A Mangano spokesman said Sunday that the Nassau County Parks Department awarded BluChip Marketing a $24,500 contract in 2013 and a $24,000 contract in 2014.

But Mangano “never had any conversations regarding these contracts” and did not personally sign off on them, spokesman Brian Nevin said, adding that he couldn’t say whether the contracts were part of a bidding process.

Meanwhile, both Mangano and Karin Caro on Sunday denied sending steamy text messages to each other. CBS2 first reported the allegations and said the messages involved a user identified as both “Ed M” and “Ed Mangano.”

In one message, a woman told “Ed Mangano”: “I want you to (blank) my brains out even if it’s in my car again,” according to CBS2.

Mangano, a Republican, said he has filed a criminal complaint with Nassau County police to find “the sick individual” behind “this smear attempt.”

Karin Caro issued a statement saying, “The alleged text messages and tweets are fabricated, false and never happened.”

Neither she nor a rep would comment on Alexander’s allegations.