A suburban Chicago state rep resigned on Wednesday after his ex-girlfriend accused him of posting nude photos of her online to initiate sexual conversations with men, according to a report.

The resignation came in an unapologetic letter after pressure from Republican leaders, including Gov. Bruce Rauner, who appointed Rep. Nick Sauer to a state board, The Chicago Sun-Times reported.

Sauer, 35, who was appointed by Rauner to be an Illinois Tollway Board director, was ironically also a member of the Illinois House Sexual Discrimination and Harassment Task Force.

The Republican pol was accused of creating a fake Instagram account and posting nude photos of his ex, then posing as her online to have salacious exchanges with other men, the paper reported.

Sauer on Wednesday afternoon submitted the resignation letter, saying he stepped down “as a result of the allegations by Kate Kelly, a former girlfriend.”

The victim filed a revenge porn complaint with Chicago Police and a complaint with the Office of the Legislative Inspector General.

The woman, 38, first called 311 on July 12 to report the allegations, charging that an ex had created fake Instagram account using her identification.

The woman said she had sent the photos to the man over a two-year period — but didn’t name her ex in the initial report.

The report didn’t describe the photos, but said her former boyfriend asked her to “participate in the acts depicted,” the paper reported.

Illinois law says that anyone convicted of revenge porn could get one to three years in prison with a fine of up to $25,000.

The allegations naming Sauer as the alleged culprit first surfaced Wednesday morning.

Sauer did not immediately respond to a request for comment from the Sun-Times.

“After speaking to my family, I feel it best to step away from my public responsibilities,” he said in a resignation letter that did not offer any apology to Kelly or his former constituents but called the allegations a “distraction.”