"Maybe that's part of my problem, is that I like the action, I like the chase -- I like all that stuff," he acknowledges. "I think it's genetic. I think it's primal for us to have that. There's certain people that you see and you just want. It's not always the most beautiful person, there's something that happens... and often times, those people that you have that for don't have that for you."
Josh Duhamel and Fergie together
Josh Duhamel and Fergie together
Actor Josh Duhamel (L) and his wife singer Fergie arrives at The Clinton Foundation Gala in celebration of the organization's "Decade of Difference" in Los Angeles October 14, 2011. REUTERS/Danny Moloshok (UNITED STATES - Tags: ENTERTAINMENT)
LAS VEGAS - DECEMBER 31: Actor Josh Duhamel and Fergie of the Black Eyed Peas attend New Year's Eve at LAX Nightclub on December 31, 2009 in Las Vegas, Nevada. (Photo by Chris Weeks/WireImage)
***WORLD EXCLUSIVE*** 18/01/09. After leaving their Malibu wedding party after 2 in the morning Sunday, Fergie and her new husband ? the freshly minted Mr. and Mrs. Josh Duhamel ? left that same afternoon for a tropical honeymoon. The Black Eyed Peas singer, 33, and the Las Vegas actor, 36, had tied the knot at the Church Estates Vineyards in Malibu. The newlyweds left Los Angeles International airport with 2 stops, Paris and Doha to arrive at Male international airport, their final destination on January 14. The couple was welcomed by the manager of the One&Only Maldives Resort at reethi Rah after a short trip by boat. One & Only Reethi Rah Hotel is a chic resort offering a level of style and sophistication unsurpassed in the Maldives. Set on one of the largest islands in North Male' Atoll, adorned with endless white sand coves and turquoise bays, all villas hav (Photo by Philip Ramey/Corbis via Getty Images)
NOVEMBER 8: Josh Duhamel and Fergie attend GLAMOUR Women of the Year Red-Carpet Arrivals at Carnegie Hall NYC on November 8, 2010 in New York City. (Photo by CHANCE YEH/Patrick McMullan via Getty Images)
LAS VEGAS - DECEMBER 31: Fergie of the Black Eyed Peas and actor Josh Duhamel attend New Year's Eve at LAX Nightclub on December 31, 2009 in Las Vegas, Nevada. (Photo by Chris Weeks/WireImage)
WESTWOOD, CA - DECEMBER 09: Josh Duhamel and Stacy 'Fergie' Ferguson attends the 'NINE' Los Angeles Premiere at Mann Village Theatre on December 9, 2009 in Westwood, California. (Photo by Steve Granitz/WireImage)
RNPS IMAGES OF THE YEAR 2011 - Cast member Josh Duhamel and his wife, Fergie, pose during the premiere of "New Year's Eve" at the Grauman's Chinese theatre in Hollywood, California, December 5, 2011. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT)
HOLLYWOOD, CA - DECEMBER 08: Actor Josh Duhamel (L) and singer Fergie arrive at the TrevorLIVE Los Angeles Benefit celebrating the Trevor Project's 15th anniversary at the Hollywood Palladium on December 8, 2013 in Hollywood, California. (Photo by Amanda Edwards/WireImage)
LOS ANGELES, CA - NOVEMBER 02: Singer Fergie and actor Josh Duhamel arrives at the LACMA 2013 Art + Film Gala on November 2, 2013 in Los Angeles, California. (Photo by Frazer Harrison/Getty Images)
LOS ANGELES, CA - DECEMBER 12: Fergie and Josh Duhamel are seen on December 12, 2013 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
NEW YORK, NY - JUNE 10: Fergie Duhamel and Josh Duhamel attend the amfAR Inspiration Gala New York 2014 at The Plaza Hotel on June 10, 2014 in New York City. (Photo by Gilbert Carrasquillo/FilmMagic)
LOS ANGELES, CA - MARCH 30: Josh Duhamel and Fergie Duhamel are seen on March 30, 2014 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
INGLEWOOD, CA - JANUARY 17: Actor Josh Duhamel and singer Fergie attend the Eagles concert and after party during The Forum Grand Opening at The Forum on January 17, 2014 in Inglewood, California. (Photo by Lester Cohen/WireImage)
LOS ANGELES, CA - MAY 17: Fergie and Josh Duhamel are seen on May 17, 2014 in Los Angeles, California. (Photo by GONZALO/Bauer-Griffin/GC Images)
LOS ANGELES, CA - NOVEMBER 23: Fergie and Josh Duhamel attend the 2014 American Music Awards at Nokia Theatre L.A. Live on November 23, 2014 in Los Angeles, California. (Photo by Kevin Mazur/AMA2014/WireImage)
LOS ANGELES, CA - FEBRUARY 20: Singer Fergie and husband actor Josh Duhamel arrive at the Tom Ford Autumn/Winter 2015 Womenswear Collection Presentation at Milk Studios on February 20, 2015 in Los Angeles, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
LOS ANGELES, CA - OCTOBER 30: Josh Duhamel and Stacy Ann Ferguson attend the Casamigos Tequila Halloween Party Brought to you by Those Who Drink It at a private residence on October 30, 2015 in Los Angeles, California. (Photo by Amy Graves/Getty Images)
LOS ANGELES, CA - JANUARY 31: Fergie and Josh Duhamel arrive at the 52nd Annual GRAMMY Awards held at the Nokia Theater on January 31, 2010 in Los Angeles, California. (Photo by Gregg DeGuire/FilmMagic)
BEVERLY HILLS, CA - NOVEMBER 07: Josh Duhamel and Fergie attend WildAid 2015 at Montage Hotel on November 7, 2015 in Beverly Hills, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - AUGUST 07: (L-R) Fergie, Axl Jack Duhamel and Josh Duhamel attend a baseball game between the between the Boston Red Sox and the Los Angeles Dodgers at Dodger Stadium on August 7, 2016 in Los Angeles, California. (Photo by Noel Vasquez/GC Images)
LOS ANGELES, CA - MARCH 31: Josh Duhamel and Fergie are seen on March 31, 2016 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
LOS ANGELES, CA - AUGUST 07: (L-R) Axl Jack Duhamel, Fergie and Josh Duhamel attend a baseball game between the between the Boston Red Sox and the Los Angeles Dodgers at Dodger Stadium on August 7, 2016 in Los Angeles, California. (Photo by Noel Vasquez/GC Images)
WEST HOLLYWOOD, CA - AUGUST 07: Fergie Duhamel and Josh Duhamel attend the Premiere of Orion Pictures' 'Spaceman' at The London Hotel on August 7, 2016 in West Hollywood, California. (Photo by JB Lacroix/WireImage)
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During the candid chat, Duhamel also looks back on his relationship with 43-year-old Fergie, and admits that he was uncomfortable with all of the attention they received as a couple.
"It had nothing to do with how much I loved her but I wasn't ready for all of that," he admits. "I still get, 'Oh my God, you're that guy, you're Fergie's husband'... it took me a long time to get past that. I don't know if it was my ego or what. I was like, 'I'm a person too. I'm not just Mr. Fergie.' But I learned to just find it endearing. You know, we were together for a long time and I just laughed it off."
Still, the actor insists that Fergie's star power wasn't what ended their marriage, after Shepard, himself, admitted it initially bothered him that his own wife, Kristen Bell, earns more money than him.
"Yeah, of course, I mean she made a lot more money than I did, but again, it's not really about that," Duhamel shares. "At the end of the day, I'm always going to have her back. It was tough, the public part of it wasn't an easy thing to go through, especially the breakup."
"I don't know if people were rooting for us or not, but there's something sad about that because you want to root for people to stay together, you know?" he adds. "And once you get past that and not really give a s**t what people think and just focus on the child... It just didn't work and at the same time, I really don't care anymore. ... What really matters is that we are united in raising our son. That's all I really care about."
Clearly, Duhamel and Fergie are still on great terms.
“Fergie and I had a great relationship," he says. "I love that girl and I always will. Unfortunately, we didn’t work. But I will always have her back and she is the mother of my baby. She's awesome."