An inmate who was Jeffrey Epstein’s suicide-watch “companion” in their Manhattan lockup has insisted the pedophile was “not depressed” before he hanged himself.

Bill Mersey, 69, told Fox Nation that he signed up for the companion program because he knew his time in the Metropolitan Correctional Center would be “really boring.”

He ended up paired with multimillionaire pedophile Epstein, 66, getting to befriend him and monitor his behavior for hours at a time.

“He was not depressed,” Mersey told the new Fox Nation documentary, “The Final Hours of Jeffrey Epstein.”

“Although I would have conversations with him and every so often where he’d sort of drift off, and I’d go, ‘Ah, he’s thinking about the s–tstorm he’s in the middle of.'”

Epstein — who was potentially facing a long stretch in prison on serious sex crime charges — was terrified of being behind bars, Mersey admitted.

“The majority of the conversations were first and foremost about his safety and how to handle prison — over and over again,” he told the documentary. “He solicited advice on how to handle the general population. He thought that intimidation was going to be a problem.”

Despite not seeing any suicidal tendencies in his companion, Mersey does not buy the suggestion that the convicted pedophile would have no way of killing himself. “He had enough space to hang himself. The bunk beds get pretty high, so you could rig something up and you could kill yourself,” he insisted.

Mersey said his job was to “be alert for four hours, sit in front of a window across from one inmate that you’re watching … and write down every 15 minutes what’s going on.”

“We had normal guy conversations, a lot of sports, a lot of crime — tons of crime,” he recalled, saying Epstein was “just a regular guy” who was “like everybody I went to high school with on Long Island.”

He recalled one unusual conversation in which the multimillionaire investor advised him that “stocks are like p—y,” with Mersey chuckling as he recalled, “And that was Jeffrey Epstein’s investment advice.”