Tad Cummins' wife says she warned her husband about getting too close to teen

Tad Cummins' wife says she warned her husband against getting too close to his 15-year-old student after noticing they had been becoming friendly.

Speaking exclusively to Inside Edition, Jill Cummins said she and her husband had been trying to help Elizabeth Thomas through some tough times at home and thought of her as another daughter.

Read: Man Who Cracked Missing Student and Teacher Case Says Teen 'Looked Depressed'

But she noticed her husband and the teen were getting a little too friendly before vanishing together in March.

"He was getting really close to her," she said. "A father-daughter close, a friendship close, and I knew that. I discussed that with him. And explained to him, 'She's your student, you can't be so close to her.'"

But she added: "Never did I think there was a romantic thing between the two of them. There were no signs of that."

See Cummins and his teen abductee:

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Elizabeth Thomas and Tad Cummins case
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Elizabeth Thomas and Tad Cummins case
Tad Cummins, 50, a former Tennessee high school teacher accused of abducting a 15-year-old student in March, seen in this booking photo after his arrest by Siskiyou County Sheriff?s Department?s Special Response Team (SRT) in Cecilville area of Siskiyou County, California, U.S. on April 20, 2017. Courtesy SCSO/Handout via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. TPX IMAGES OF THE DAY
Siskiyou County Sheriff Jon Lopey announces the arrest of fugitive Tad Cummins, a former high school teacher accused of kidnapping 15 year old student Elizabeth Thomas, in Yreka, California, U.S. April 20, 2017. REUTERS/Jim Urquhart
#TNAMBERAlert: She's a high school freshman. He was a teacher accused of kidnapping her. Let's find her now! UPDATE… https://t.co/PD9FWyaUQN
Siskiyou County Sheriff Jon Lopey announces the arrest of fugitive Tad Cummins, a former high school teacher accused of kidnapping 15 year old student Elizabeth Thomas, in Yreka, California, U.S. April 20, 2017. REUTERS/Jim Urquhart
#TNAMBERAlert SIGHTING CONFIRMED: Tad Cummins and Elizabeth Thomas were in Oklahoma City on March 15th. DETAILS:… https://t.co/ZZ5oy2fDuA
This has been upgraded to statewide AMBER ALERT: Suspect Tad Cummins was a teacher at Maury Co. Schools. Anyone w/… https://t.co/6QFON36i19
NEW PICTURE: Here's the last known photograph of Elizabeth Thomas prior to her alleged kidnapping. Spot her? 1-800-… https://t.co/a2h7G50wPw
VIDEO: Here's surveillance of AMBER Alert suspect Tad Cummins, days before disappearing with Elizabeth Thomas. https://t.co/j1fuc5VJWH
New surveillance video of Tad Cummins accused of kidnapping 15 y/o girl appears to show him looking at hair colorin… https://t.co/Iii6HND7oB
TBI: Elizabeth Thomas & Tad Cummins may be wearing the clothes they disappeared in when AMBER Alert was issued:… https://t.co/2uljf6bz8d
NEW PICTURES: Various shots of Ted Cummins in the past few weeks, including the vehicle he's believed to be driving… https://t.co/ldcK8s2Kaf
UPDATE: Here's the latest in our ongoing #TNAMBERAlert. We're doing everything we can to bring Elizabeth home.… https://t.co/Iu084rDY9m
MEDIA: Here's a quick video clip of Tad Cummins & Elizabeth Thomas entering the Walmart in Oklahoma City on 3/15. https://t.co/tIsI94rT6a
Tad Cummins, a former high school teacher accused of luring a 15-year-old student into his car outside of a restaurant and disappearing with the girl, is pictured in this police handout photo. Maury County Sheriff's Office/Handout via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY.
Tad Cummins, a former high school teacher accused of luring a 15-year-old student into his car outside of a restaurant and disappearing with the girl, is pictured in this police handout photo. Maury County Sheriff's Office/Handout via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY.
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Jill, who filed for divorce from Tad when he disappeared with the teenager, agrees that Thomas was exploited and perhaps even brainwashed.

"I feel slightly betrayed by her because she knew me," she added. "I don't really want to talk to her. It's not the right time. Maybe one day."

A rep for Elizabeth Thomas called Tad Cummins a "classic predator" who brainwashed the teen into running away with him.

Jill also revealed that she played a key role behind the scenes when her husband took off. She made a moving television appeal for Cummins to turn himself in, which she said was her idea.

Jill also gave investigators every clue she could.

Read: Tad Cummins' Wife: He Told Me He Slept With Teenage Student

"They would send me pictures from surveillance cameras to get my opinion whether or not it was him," she claimed.

After five weeks, Cummins and the teenager were found at a remote cabin in Cecilville, Calif., when a tipster recognized them and called authorities.

Thomas was reunited with her family while Cummins was arrested. He appeared in court in Sacramento on Monday and faces one federal count of transporting a minor with the intent to engage in sexual activity across state lines.

He has not entered a plea. He's expected to be transported to federal court in Tennessee within weeks.

He faces a minimum sentence of 10 years and up to life in prison, if convicted.

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