A jilted ex-boyfriend allegedly retaliated against a former flame whom he ran into with another man at the gym by posting revenge porn on social media, police said.

Alfred Kluge, 25, was arrested Tuesday on sexual cyber-harassment charges in Marathon, Fla., after the nude photos were shared to his Facebook and Snapchat accounts, the Miami Herald reported.

Kluge reportedly texted the woman following the gym encounter saying, “You forced my hand.”

“No more than 13 people saw the pictures,” Kluge allegedly told his ex. “I do sincerely apologize but I had a reason for doing so.”

The distraught woman told authorities the X-rated pics were taken while the pair was in a relationship “and were for them only,” according to the police report.

Kluge was booked Tuesday at Stock Island Detention Center but later released.