Casey Affleck and Summer Phoenix have decided to call it quits after nearly 10 years of marriage.
"Casey and Summer have amicably separated. They remain very close friends," Affleck's rep told ET on Wednesday.
Affleck, 40, and Phoenix, 37, have two sons together -- 11-year-old Indiana and 8-year-old Atticus -- and have been married since June 2006. Affleck is close friends with Phoenix's older brother, actor Joaquin Phoenix, whom he collaborated with on 2010's controversial I'm Still Here.
Interestingly enough, Affleck's older brother, Ben Affleck, also split with his ex, Jennifer Garner, last June at the 10-year mark of their marriage.
See photos of the couple together over the years:
Casey Affleck and Summer Phoenix
Casey Affleck and Summer Phoenix split after 10 years of marriage
UNITED STATES - OCTOBER 18: Actor Casey Affleck and his girlfriend, actress Summer Phoenix, share a table at party following the screening of the movie 'Quills' at the club Light. (Photo by Richard Corkery/NY Daily News Archive via Getty Images)
WESTWOOD, CA - DECEMBER 5: Actress Summer Phoenix and actor Casey Affleck attend the 'Ocean's Eleven' Westwood Premiere on December 5, 2001 at the Mann Village Theatre in Westwood, California. (Photo by Ron Galella, Ltd./WireImage)
Casey Affleck and Summer Phoenix during 'The Laramie Project' Sundance Screening, 2002 in Park City, Utah, United States. (Photo by Jeff Kravitz/FilmMagic, Inc)
Casey Affleck with girlfriend Summer Phoenix leaving the premiere for 'Gerry' at the 2002 Sundance Film Festival in Park City, Utah. 1/12/2002. Photo:Evan Agostini/ImageDirect
UNITED STATES - JANUARY 31: Casey Affleck, winner of the Male Star of Tomorrow award, with his girlfriend, Summer Phoenix, at the Motion Picture Club's 62nd annual Awards and Installation Luncheon at the New York Marriott Marquis hotel. (Photo by Richard Corkery/NY Daily News Archive via Getty Images)
Summer Phoenix & Casey Affleck during The 17th Annual IFP/West Independent Spirit Awards - Arrivals at Santa Monica Beach in Santa Monica, California, United States. (Photo by KMazur/WireImage)
Casey Affleck & Summer Phoenix during 2002 Vanity Fair Oscar Party Hosted by Graydon Carter - Arrivals at Morton's Restaurant in Beverly Hills, California, United States. (Photo by J. Vespa/WireImage)
404703 12: Actors Summer Phoenix (L) and Casey Affleck perform a scene from the play 'This Is Our Youth' at the Garrick Theatre April 30, 2002 in the West End of London. (Photo by Anthony Harvey/Getty Images)
Jake Gyllenhaal, Summer Phoenix and Casey Affleck (Photo by J. Vespa/WireImage)
NEW YORK - FEBRUARY 4: Actress Summer Phoenix (L) and actor Casey Affleck pose for a photo during the after-party for the New York premiere of 'Gerry' February 4, 2003 at Sciuscia restaurant in New York City. (Photo by Scott Gries/Getty Images)
Summer Phoenix and Casey Affleck during Maybach Presentation Cocktail Reception at Guggenheim Museum in New York City, New York, United States. (Photo by Theo Wargo/WireImage)
Casey Affleck and Summer Phoenix during The 2004 New York Film Critics Circle 69th Annual Awards Dinner - Outside Arrivals - By Ron Galella at Noche Restaurant in New York City, New York, United States. (Photo by Ron Galella/WireImage)
Casey Affleck and Summer Phoenix at the Esquire House 360 in Beverly Hills, California (Photo by John Sciulli/WireImage)
VENICE, ITALY - SEPTEMBER 02: Summer Phoenix and Casey Affleck attend The Assassination Of Jesse James By The Coward Robert Ford premiere in Venice during day 5 of the 64th Venice Film Festival on September 2, 2007 in Venice, Italy. (Photo by Jeff Vespa/WireImage)
HOLLYWOOD - FEBRUARY 24: Actor Casey Affleck (R) and wife/actress Summer Phoenix arrive at the 80th Annual Academy Awards held at the Kodak Theatre on February 24, 2008 in Hollywood, California. (Photo by Frazer Harrison/Getty Images)
NEW YORK - APRIL 27: Summer Phoenix and Casey Affleck attends the premiere of 'The Killer Inside Me' during the 2010 Tribeca Film Festival at the School of Visual Arts Theater on April 27, 2010 in New York City. (Photo by Bryan Bedder/Getty Images for Tribeca Film Festival)
LOS ANGELES, CA - SEPTEMBER 25: Actor/Director Casey Affleck (R) and wife Summer Phoenix arrive at PETA's 30th Anniversary Gala and Humanitarian Awards at The Hollywood Palladium on September 25, 2010 in Los Angeles, California. (Photo by Michael Kovac/FilmMagic)
NEW YORK, NY - MAY 07: Summer Phoenix and Casey Affleck attend the 'Schiaparelli And Prada: Impossible Conversations' Costume Institute Gala at the Metropolitan Museum of Art on May 7, 2012 in New York City. (Photo by Dimitrios Kambouris/Getty Images)
WEST HOLLYWOOD, CA - FEBRUARY 24: Summer Phoenix and Casey Affleck arrive at the 2013 Vanity Fair Oscar Party hosted by Graydon Carter at Sunset Tower on February 24, 2013 in West Hollywood, California. (Photo by Pascal Le Segretain/Getty Images)
HOLLYWOOD, CA - NOVEMBER 09: Actors Summer Phoenix and Casey Affleck attend the screening of 'Out of the Furnace' during AFI FEST 2013 presented by Audi at TCL Chinese Theatre on November 9, 2013 in Hollywood, California. (Photo by Alberto E. Rodriguez/Getty Images for AFI)
WASHINGTON, DC - MAY 03: Summer Phoenix and Casey Affleck attend the 2014 Annual Garden Brunch at the Beall-Washington House on May 3, 2014 in Washington, DC. (Photo by Andrew H. Walker/Getty Images)
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These days, the Batman v Superman: Dawn of Justice star says he's "on great terms" with Garner. "Jen's great. She's a great person," the two-time Oscar winner recently told The New York Times. "We're on great terms. I just saw her this morning, so that's the reality that I live in."
"She felt like she wanted to discuss it and get it out there and get it over with, so she could say, 'Look, I already talked about it -- I don't want to do it again,'" Affleck shared. "It's fine. She's allowed to talk about it."