BISMARCK, N.D. (AP) -- An 80-year-old man accused of locking his girlfriend in a camper trailer has been sentenced to probation and ordered to attend an anger management class when he returns home to Oregon.

Theodore Matylinske, of Madras, Ore., was arrested on Wednesday near Bismarck after his traveling companion, Sandra Smith, 61, called police to say she was locked in a camper trailer being pulled down the interstate.

Burleigh County Sheriff Pat Heinert said Smith indicated she had made an appointment at a beauty shop in Bismarck, but Matylinske wanted to get back on the road.

"She was miffed because she couldn't get her hair and nails done," Matylinske told South Central District Judge David Reich on Thursday. Matylinske said he and Smith had been arguing about attractions to see in the area.

Assistant Burleigh County State's Attorney Julie Lawyer said Matylinske pushed Smith into the trailer during an argument outside a store.

Matylinske told authorities she had locked herself in the trailer. But Lawyer said the trailer had been latched from the outside.

Matylinske told Reich he had been traveling with Smith for five years. Matylinske said he had offered to let Smith ride up front with him, to drive or to go to the airport. He said he also offered Smith a walkie-talkie so she could communicate from the trailer, but she declined.

"I was stopping periodically to check how she was doing," Matylinske told the judge. "That's the way it went. She had options she didn't take."

Matylinske pleaded guilty to a misdemeanor charge of unlawful imprisonment. He said he pleaded guilty to the charge to avoid traveling back to North Dakota.

"I'm just doing this so I don't have to come back in the long run," he said.

Matylinske asked the judge to speak up in court, saying he needed a hearing aid but did not have one. He also said he could not read the complaint filed against him because he did not have his glasses.

Reich sentenced Matylinske to 60 days in jail with all but time served suspended and one year of unsupervised probation. He also ordered Matylinske to pay $350 in court fees and to attend the anger management class.

Smith told the judge that she would help Matylinske pay the court fees.