Inside Channing Tatum and Jenna Dewan's split: It's been 'brewing for a while' (Exclusive)

Channing Tatum and Jenna Dewan announced they were calling it quits after eight years of marriage on Monday, but multiple sources tell ET that the breakup has been a long time coming. 

The split "has been brewing for a while," one source tells ET. 

"They have been fighting the last couple of years -- quite a bit," a second source notes. "There is a sense of relief on both of their parts."

The source continues, "They have tried working on things and had therapy but nothing changed."

See photos of Channing and Jenna together:

28 PHOTOS
Channing Tatum and Jenna Dewan together through the years
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Channing Tatum and Jenna Dewan together through the years
LOS ANGELES, CA - NOVEMBER 06: Channing Tatum and Jenna Dewan Tatum attend the premiere of 'War Dog: A Soldier's Best Friend' at Directors Guild Of America on November 6, 2017 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LONDON, ENGLAND - SEPTEMBER 18: Jenna Dewan Tatum and Channing Tatum attend the 'Kingsman: The Golden Circle' World Premiere at Odeon Leicester Square on September 18, 2017 in London, England. (Photo by Karwai Tang/WireImage)
HOLLYWOOD, CA - AUGUST 03: Actor Channing Tatum (L) and actress Jenna Dewan Tatum arrive at the premiere of Amazon's 'Comrade Detective' at the ArcLight Hollywood on August 3, 2017 in Hollywood, California. (Photo by Amanda Edwards/WireImage)
LAS VEGAS, NV - APRIL 21: Actor Channing Tatum (L) and actress Jenna Dewan Tatum attend the grand opening of 'Magic Mike Live Las Vegas' at the Hard Rock Hotel & Casino on April 21, 2017 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
WEST HOLLYWOOD, CA - NOVEMBER 17: Channing Tatum, Jenna Dewan-Tatum arrives at the Variety And WWD Host 2nd Annual StyleMakers Awards at Quixote Studios West Hollywood on November 17, 2016 in West Hollywood, California. (Photo by Steve Granitz/WireImage)
LAS VEGAS, NV - APRIL 21: Actor Channing Tatum (L) and actress Jenna Dewan Tatum attend the grand opening of 'Magic Mike Live Las Vegas' at the Hard Rock Hotel & Casino on April 21, 2017 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
CULVER CITY, CA - NOVEMBER 12: Channing Tatum, Jenna Dewan Tatum arrives at the 5th Annual Baby2Baby Gala at 3LABS on November 12, 2016 in Culver City, California. (Photo by Steve Granitz/WireImage)
WESTWOOD, CA - FEBRUARY 01: Actors Channing Tatum and Jenna Dewan-Tatum arrive at the premiere of Universal Pictures' 'Hail, Caesar!' at Regency Village Theatre on February 1, 2016 in Westwood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
UNIVERSAL CITY, CA - NOVEMBER 02: Channing Tatum and Jenna Dewan Tatum attend the 22nd Fulfillment Fund Stars Benefit Gala - Arrivals at The Globe Theatre at Universal Studios on November 2, 2016 in Universal City, California. (Photo by Jerritt Clark/Getty Images)
WESTWOOD, CA - FEBRUARY 01: Actors Channing Tatum and Jenna Dewan-Tatum arrive at the premiere of Universal Pictures' 'Hail, Caesar!' at Regency Village Theatre on February 1, 2016 in Westwood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
BEVERLY HILLS, CA - JANUARY 10: Actors Channing Tatum (L) and Jenna Dewan Tatum attend the 73rd Annual Golden Globe Awards held at the Beverly Hilton Hotel on January 10, 2016 in Beverly Hills, California. (Photo by Jason Merritt/Getty Images)
LOS ANGELES, CA - DECEMBER 23: Channing Tatum (L) and Jenna Dewan attend a basketball game between the Oklahoma City Thunder and the Los Angeles Lakers at Staples Center on December 23, 2015 in Los Angeles, California. (Photo by Noel Vasquez/GC Images)
BEVERLY HILLS, CA - NOVEMBER 01: Channing Tatum and Jenna Dewan-Tatum arrives at the 19th Annual Hollywood Film Awards at The Beverly Hilton Hotel on November 1, 2015 in Beverly Hills, California. (Photo by Steve Granitz/WireImage)
LOS ANGELES, CA - OCTOBER 30: Channing Tatum and Jenna Dewan Tatum 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)
LONDON, UNITED KINGDOM - JUNE 30: Channing Tatum and Jenna Dewan-Tatum attend the European Premiere of 'Magic Mike XXL' at Vue West End on June 30, 2015 in London, England. PHOTOGRAPH BY Paul Treadway / Barcroft Media (Photo credit should read Paul Treadway / Barcroft Media via Getty Images)
HOLLYWOOD, CA - JUNE 25: Actors Channing Tatum and Jenna Dewan Tatum arrive at the Los Angeles World Premiere of Warner Bros. Pictures' 'Magic Mike XXL' at TCL Chinese Theatre IMAX on June 25, 2015 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
BEVERLY HILLS, CA - MARCH 21: Actor Channing Tatum and actress Jenna Dewan Tatum attend the 26th annual GLAAD Media Awards at The Beverly Hilton Hotel on March 21, 2015 in Beverly Hills, California. (Photo by Jason LaVeris/FilmMagic)
HOLLYWOOD, CA - FEBRUARY 22: Actors Channing Tatum (L) and Jenna Dewan-Tatum arrive at the 87th Annual Academy Awards at Hollywood & Highland Center on February 22, 2015 in Hollywood, California.(Photo by Jeffrey Mayer/WireImage)
HOLLYWOOD, CA - FEBRUARY 22: Actors Channing Tatum (L) and Jenna Dewan Tatum attend the 87th Annual Academy Awards at Hollywood & Highland Center on February 22, 2015 in Hollywood, California. (Photo by Jason Merritt/Getty Images)
BEVERLY HILLS, CA - JANUARY 11: Channing Tatum and Jenna Dewan Tatum arrives at the 72nd Annual Golden Globe Awards at The Beverly Hilton Hotel on January 11, 2015 in Beverly Hills, California. (Photo by Steve Granitz/WireImage)
WESTWOOD, CA - JUNE 10: (L-R) Actor/producer Channing Tatum and wife actress Jenna Dewan-Tatum arrive at the Los Angeles Premiere '22 Jump Street' on June 10, 2014 at Regency Village Theatre in Westwood, California. (Photo by Barry King/FilmMagic)
WEST HOLLYWOOD, CA - MARCH 02: Channing Tatum and Jenna Dewan attend the 2014 Vanity Fair Oscar Party hosted by Graydon Carter on March 2, 2014 in West Hollywood, California. (Photo by Jon Kopaloff/FilmMagic)
LOS ANGELES, CA - February 24, 2013 Channing Tatum ans wife Jenna Dewan arriving for the 85th Annual Academy Awards on Sunday, February 24, 2013 at the Dolby Theatre at Hollywood & Highland Center in Los Angeles, CA. (Photo by Jay L. Clendenin/Los Angeles Times via Getty Images)
UNIVERSAL CITY, CA - AUGUST 8: Channing Tatum and Jenna Dewan attend Teen Choice 2010 held at the Gibson Amphitheatre on August 8, 2010 in Universal City, California. (Photo by Gregg DeGuire/FilmMagic)
Actor Channing Tatum and Jenna Dewan arrive at The Cosmopolitan Grand Opening and New Year's Eve Celebration with Jay-Z and Coldplay at Marquee Nightclub in The Cosmopolitan on December 31, 2010 in Las Vegas, Nevada.
HOLLYWOOD, CA - FEBRUARY 21: Actors Jenna Dewan and Channing Tatum attend Vanity Fair Campaign Hollywood 2011's kick off with Chrysler Celebrating 'The Fighter' held at the District on Sunset on February 21, 2011 in Hollywood, California. (Photo by Donato Sardella/Getty Images for Vanity Fair)
HOLLYWOOD, CA - FEBRUARY 06: Channing Tatum and Jenna Dewan-Tatum arrive to 'The Vow' Los Angeles Premiere at Grauman's Chinese Theatre on February 6, 2012 in Hollywood, California. (Photo by John Shearer/WireImage)
Channing Tatum and Jenna Dewan (Photo by Jesse Grant/WireImage)
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However, according to our second source, it looks like the breakup is the best for both Dewan and Tatum.

"She will blossom without him," the source says. "And Channing finally doesn’t have to hide that he was ready to move on."

ET has reached out to Dewan and Tatum's reps for comment. 

On Monday, the Step Up stars, both 37, made it clear in a joint statement on Instagram that they were still on good terms, and would continue to co-parent their 4-year-old daughter, Everly. 

"We have lovingly chosen to separate as a couple," the statement read. "We fell deeply in love so many years ago and have had a magical journey together. Absolutely nothing has changed about how much we love one another, but love is a beautiful adventure that is taking us on different paths for now."

"There are no secrets nor salacious events at the root of our decision — just two best-friends realizing it’s time to take some space and help each other live the most joyous, fulfilled lives as possible," the statement continued. "We are still a family and will always be loving dedicated parents to Everly."

Hours before the split was announced, Dewan was snapped in Los Angeles, still wearing her wedding ring.

See photos of their daughter Everly:

27 PHOTOS
Channing Tatum and Jenna Dewan hiding daughter's face on Instagram
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Channing Tatum and Jenna Dewan hiding daughter's face on Instagram
Onesies pimp walk
Happy birthday my angel!
A girl and her doggie ❤️🐶 Also- bringing hipstamatic back
There's a fairy in my garden today
But most importantly.....celebrating this little angel turning 4 today....!!!!!! I love you so much little monkey Evie 💕💕💕💕💕💕
Getting through Monday like...
Keeping Grandpops young ;)
So excited for the #HailCaesar premiere tonight! Chan!! Tapping!!!! But first- glam, babes, and Frozen obviously
Tonight's the night!!! Premiere of @supergirlofficial !! This house is very excited
Princess Timberland 👸🏼
Vacation has been amazing feeling so blessed and grateful. 🙏🏻🙏🏻
mom life last night♥️
So @Reebok challenged me to #getpumped and run this hill 10x on a sat morning...buuuut I had a lil helper too.
To say my life completely changed when this little angel was born is an understatement. The love I feel is overwhelming. Thank you Evie for showing me what life is about and choosing me as your mommy♥️♥️ And to all the mamas out there- you are WARRIORS and I bow down to you all. Take some time today to love and spoil yourself :) Happy Mothers Day!!
Happy Halloween from our little lady bug!! She just moves too darn fast to get a good pic
Girl and her goat. RIP Heather. You had a damn good long run sweets.
Feel beautiful on the inside
My little bunny on her way to her Easter party holding her new little bunny 🐰😍😍
Early Easter Eggs
Practicing her magic 🌟
Till next time Vancouver💕
We couldn't love this daddy more! You are all heart and we are so grateful for you every day❤️❤️
❤️🍓❤️🍓❤️🍓❤️🍓❤️
Oh man... Storytime is gonna be epic tonight.
Ohhh how I miss these cuddle naps❤️Becoming a mother is the most amazing journey of my life. The love that I have for this little soul is beyond explanation and humbles me every day😍I love you Evie T!! Happy Mother's Day to all!!
I spy a little elf 😍🎄
I took this just days after jenna and I (mostly jenna) brought our little girl into the world. I've taken many like it over the past 3 years but this is one of my favorites. She was so tired. Haha. But she has such deep strength and other worldly grace. Watching her in those first days transform into a mother was life changing. She was every bit the beautiful, sexy, funny, flawed creature I fell in love with. But the prism turned and showed a whole new light that I had no idea existed, the light of a mothers love. Thank you for that baby. Saw this quote today --" The most important thing a father can do for his children is to love their mother. Theodore Hesburgh" there are a lot of important things in being a father. Who knows what the most important thing is? All I know is that in my case this is pretty high on my list. Love you cake!
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-- Reporting by Adriane Schwartz

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