Boyfriend of missing Iowa college student says 'it gets harder day by day'

The boyfriend of missing Iowa college student Mollie Tibbetts spoke about how hard it has been since she disappeared.

"Initially, it was shock and then, you know, it gets harder day by day because she's still not here and you miss her, you miss her more than anything in the world," Dalton Jack said in an interview.

Jack, who working a job in Dubuque, Iowa, on the night Tibbetts went missing, is not a suspect in the investigation.

Photos from the case: 

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Missing Iowa student Mollie Tibbetts found dead
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Missing Iowa student Mollie Tibbetts found dead
A ribbon for missing University of Iowa student Mollie Tibbetts hangs on a light post, Tuesday, Aug. 21, 2018, in Brooklyn, Iowa. Tibbetts was reported missing from her hometown in the eastern Iowa city of Brooklyn in July 2018. (AP Photo/Charlie Neibergall)
This undated photo provided by the Iowa Department of Public Safety shows Cristhian Bahena Rivera. Authorities said on Tuesday, Aug. 21, 2018, that they have charged a man living in the U.S. illegally with murder in the death of Iowa college student, Mollie Tibbetts, who disappeared a month ago while jogging in a rural area. Iowa Division of Criminal Investigation Special Agent Rick Rahn said that Rivera, 24, was charged with murder in the death of Tibbetts. (Iowa Department of Public Safety via AP)
A county truck blocks a gravel road, Tuesday, Aug. 21, 2018, near Brooklyn, Iowa. Police say a body believed to be that of 20-year-old college student Mollie Tibbetts has been discovered in a rural area near where she went missing last month. University of Iowa student Mollie Tibbetts was reported missing from her hometown in the eastern Iowa city of Brooklyn in July 2018. (AP Photo/Charlie Neibergall)
People in the courtroom reacts after Cristhian Bahena Rivera's initial court appearance, Wednesday, Aug. 22, 2018, at the Poweshiek County Courthouse in Montezuma, Iowa. Rivera is charged with first-degree murder in the death of Mollie Tibbetts, who disappeared July 18 from Brooklyn, Iowa. (Jim Slosiarek/The Gazette via AP, Pool)
(Photo via Facebook)
Cristhian Bahena Rivera speaks with his attorney during his initial court appearance, Wednesday, Aug. 22, 2018, at the Poweshiek County Courthouse in Montezuma, Iowa. Rivera is charged with first-degree murder in the death of Mollie Tibbetts, who disappeared July 18 from Brooklyn, Iowa. (Jim Slosiarek/The Gazette via AP, Pool)
(Photo via Instagram)
A poster for missing University of Iowa student Mollie Tibbetts hangs in the window of a local business, Tuesday, Aug. 21, 2018, in Brooklyn, Iowa. Tibbetts was reported missing from her hometown in the eastern Iowa city of Brooklyn in July 2018. (AP Photo/Charlie Neibergall)
My first experience as a best man went well🎉
Cristhian Bahena Rivera is escorted into the Poweshiek County Courthouse for his initial court appearance, Wednesday, Aug. 22, 2018, in Montezuma, Iowa. Rivera is charged with first-degree murder in the death of Mollie Tibbetts, who disappeared July 18 from Brooklyn, Iowa. (AP Photo/Charlie Neibergall)
You guys really thought I was gonna let a birthday pass without a selfie?😎 (posting a day after but I took it on my birthday so whatever)
Just a Hawkeye with her hot guy 💛🖤
A poster for missing University of Iowa student Mollie Tibbetts hangs on the front door of a local business, Tuesday, Aug. 21, 2018, in Brooklyn, Iowa. Police say a body believed to be that of 20-year-old college student Mollie Tibbetts has been discovered in a rural area near where she went missing last month.Tibbetts was reported missing from her hometown in the eastern Iowa city of Brooklyn in July 2018. (AP Photo/Charlie Neibergall)
Happiest of birthdays to the person who made track bearable. Of all of the laps we ran together, the last one was the hardest (even if we made it the slowest) because we were ending quite an era😉 You are such a happy, hardworking, and genuine person, and I'm so lucky I get to call you my friend. Happy birthday my dude 😘😊
A ribbon for missing University of Iowa student Mollie Tibbetts hangs on a light post, Tuesday, Aug. 21, 2018, in Brooklyn, Iowa. Police say a body believed to be that of 20-year-old college student Mollie Tibbetts has been discovered in a rural area near where she went missing last month. Tibbetts was reported missing from her hometown in the eastern Iowa city of Brooklyn in July 2018. (AP Photo/Charlie Neibergall)
Cristhian Bahena Rivera is escorted into the Poweshiek County Courthouse for his initial court appearance, Wednesday, Aug. 22, 2018, in Montezuma, Iowa. Rivera is charged with first-degree murder in the death of Mollie Tibbetts, who disappeared July 18 from Brooklyn, Iowa. (AP Photo/Charlie Neibergall)
Currently wishing I was exploring water falls with best friend instead of sitting in an airport
A poster for missing University of Iowa student Mollie Tibbetts hangs in the window of a local business, Tuesday, Aug. 21, 2018, in Brooklyn, Iowa. Tibbetts was reported missing from her hometown in the eastern Iowa city of Brooklyn in July 2018. (AP Photo/Charlie Neibergall)
I can't think of a caption but New York is cool
A poster for missing University of Iowa student Mollie Tibbetts hangs in the window of a local business, Tuesday, Aug. 21, 2018, in Brooklyn, Iowa. Tibbetts was reported missing from her hometown in the eastern Iowa city of Brooklyn in July 2018. (AP Photo/Charlie Neibergall)
Cristhian Bahena Rivera is lead into the courtroom for his initial court appearance, Wednesday, Aug. 22, 2018, at the Poweshiek County Courthouse in Montezuma, Iowa. Rivera is charged with first-degree murder in the death of Mollie Tibbetts, who disappeared July 18 from Brooklyn, Iowa. (Jim Slosiarek/The Gazette via AP, Pool)
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Tibbetts, 20, was last seen jogging on the evening of July 18 in Brooklyn, Iowa, said Kevin Winker of the Iowa Department of Public Safety. Tibbetts was believed to be wearing dark running shorts, a pink sports top and running shoes, according to police.

She was reported missing the following day after not showing up to her job at a day care.

Jack told the TV station KCRG that Tibbetts had sent him a Snapchat late on July 18, presumably after she had gotten back from her run.

"She's not going to run off," Jack said in an interview. "I try not to speculate on it too much because the only thing that comes into your head whenever you're not investigating all the facts is that something bad happened and you don't, I personally don't want to believe that."

Investigators are looking to explore Tibbetts' digital footprint, specifically looking at a Fitbit device which she would have been wearing during her jog, according to NBC affiliate KWWL.

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