Jayme Closs’ alleged kidnapper was a teen loner who lived in a “time warp” with no online presence — instead spending all his time inside his family’s remote cabin reading books about outdoor survival and the military, according to a new report.

A former neighbor of Jake Patterson — the 21-year-old accused of killing Closs’ parents and then holding the teen girl hostage in the Wisconsin cabin for 88 days until she escaped last week — tells the Daily Mail he didn’t have a Facebook account or even an email address when they were in high school.

“His family were nice people but Jake’s life was like something from a time warp. If he had a cell phone it was not a smart phone. All he was interested in was books,” Tristan Roberts, who grew up near the cabin, told the UK newspaper.

“He didn’t socialize, he didn’t have what you would call real friends, just acquaintances. He just wanted to get home to read about survival and the military.”

Roberts says Patterson changed a lot after his mom left the family when he was around 9 or 10 years old.

“He went home and sat on his bed reading books. He didn’t let anybody in and he didn’t let anything out,” Roberts told the paper.

Patterson’s dad and siblings also eventually moved out of the remote cabin, leaving him living there alone.

Roberts says he and Patterson hung out and shared rides to school together as teens — and that the accused killer was smart and showed compassion toward animals.

But his neighbor also once showed his dark side after Roberts accidentally brushed his bag against Patterson’s head on a school bus.

“He turned around and punched me in the nose. I was looking down at my phone at the time, not expecting it,” Roberts told the Daily Mail.

“Then we got into a scuffle and the bus driver actually stopped the bus. It was a good fist fight, we both got in a few shots.”

Based on that experience, he tells the paper: “So, is Jake Patterson capable of doing something terrible? I would say yes, he could shoot someone. I saw the rage in his eyes.”