A Long Island man claims a “Shark Tank” contestant has been badmouthing him because he accused her of stealing his business idea.

Lori Cheek, 47, patented her idea for a dating business in 2010, and gave up an architecture career to create Cheek’d. Clients looking for romance but too shy to make a move are given business cards which they can hand to potential flames. The cards have a code leading to an online dating profile.

Cheek’s pitch for the business was not only rejected by the sharks on a 2014 “Shark Tank” episode, but it also landed her in court, where Alfred Pirri, 63, claims he came up with the same idea in 2006. Pirri never put the plan into action, but sued Cheek after viewing her “Shark Tank” appearance.

In Pirri’s Manhattan Federal Court lawsuit filed earlier this year, he claimed he only told his therapist of his plans for the business, which he described as “dating-in-reverse,” and alleges the therapist admitted sharing the information with a friend, who turned out to be Cheek. The therapist allegedly repeatedly assured Pirri her friend wouldn’t pursue the business idea. Cheek denied the allegation she stole the inspiration for Cheek’d.

But Cheek has been taking their dispute outside the courtroom, Pirri claims in a newly filed Manhattan Supreme Court defamation lawsuit against the former architect, claiming she’s been trying to destroy his reputation by repeatedly calling him “crazy” on social media.

Cheek allegedly claimed Pirri had been in a mental facility, and told a news reporter Pirri was a “scammer,” he charges in the new suit, which seeks $4 million in damages.

A lawyer for Cheek didn’t respond to a message.