Matt Damon stays by Ben Affleck's side amid the latter's rumored marital strife with Jennifer Lopez, a source has claimed.

Damon and Affleck have been good friends even before they made it big in Hollywood. The childhood friends have remained the best buddies despite their success in the industry and Damon is making sure that his pal will be "out of trouble" despite his personal issues, according to an insider.

"Matt's No. 1 priority right now is keeping Ben out of trouble," an unnamed source told In Touch. "The last thing anyone wants is for Ben to turn to alcohol again. Matt has straight out told him that relapse is not an option."

Enstarz could not independently verify the claim.

Ben Affleck and Matt Damon
(L-R) Ben Affleck and Matt Damon attend the "AIR" world premiere during the 2023 SXSW Conference and Festivals at The Paramount Theater on March 18, 2023 in Austin, Texas. Michael Loccisano/Getty Images

Affleck has been open about his alcohol addiction problems. His ex-wife, Jennifer Garner, even drove him to rehab in 2018.

"Matt's No. 1 priority right now is keeping Ben out of trouble," the tipster continued. "The last thing anyone wants is for Ben to turn to alcohol again. Matt has straight out told him that relapse is not an option."

Another tipster claimed to the Daily Mail that the "Martian" star helped Affleck "get it together" when the "Gone Girl" actor and "Let's Get Loud" singer split in 2004. However, when Affleck and Lopez, dubbed "Bennifer," reconciled in 2021, Damon allegedly "felt" history would repeat itself. But this time, he was determined to help Affleck avoid setbacks in his sobriety journey.

Matt Damon
Emma McIntyre/Getty Images

"Matt is the only real guy friend Ben has. He would not let him get back on the bottle and has been on him to make sure of this," the source added.

In December 2021, Affleck sat down for an interview with Howard Stern, and he admitted that he felt "trapped" in his marriage with Garner and started drinking.

"We had a marriage that didn't work," Affleck told Stern. "This happens. It was somebody I love and respect but to whom I shouldn't be married any longer ... what I did was [I] drank a bottle of scotch and fell asleep on the couch, which turned out not to be the solution."

Affleck's statement raised eyebrows, with many slamming him for seemingly blaming his ex-wife and marriage for his alcohol problem. He later clarified in an interview on "Jimmy Kimmel Live" that his remarks were taken out of context for "clickbait" headlines.

Jennifer Garner and Ben Affleck
Actor Ben Affleck and actress Jennifer Garner pose during the 16th annual Critics' Choice Movie Awards at the Hollywood Palladium on January 14, 2011 in Los Angeles, California. Christopher Polk/Getty Images for VH1

"We had a marriage that didn't work," Affleck told Stern. "This happens. It was somebody I love and respect but to whom I shouldn't be married any longer ... what I did was [I] drank a bottle of scotch and fell asleep on the couch, which turned out not to be the solution."

He added, "I had gone on and said how much we respect each other and cared about each other, and cared about our kids and put them first and went through our stuff. And they said that I had blamed my ex-wife for my alcoholism and that I was trapped."

Lopez and Affleck have been plagued with divorce rumors for months. They have been living separately and already put their $60 million marital home for sale. Another tipster claimed that Lopez wants all the money she "invested" in their marriage because it was Affleck who allegedly "abandoned her."

Ben Affleck and Jennifer Lopez
Ben Affleck and Jennifer Lopez attend ELLE's Women In Hollywood Celebration at Nya Studios on December 05, 2023 in Los Angeles, California. Kevin Winter/Getty Images
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Matt Damon, Jennifer Lopez, Ben Affleck