The actor's mom has "been there for him through this extremely difficult time," a source tells PEOPLE

By Tierney McAfee
Updated July 03, 2015 03:30 PM
GC Images

Ben Affleck is leaning on his mother after he and wife Jennifer Garner announced this week that they had made the “difficult decision to divorce” after 10 years of marriage.

“While Jen is turning to her family and friends, the person in Ben’s life is his mother,” a source close to the couple tells PEOPLE. “She is a constant rock for him. She had remained close to the family as well. She’s been there for him through this extremely difficult time.”

Affleck and his children, Violet, 9, Seraphina, 6, and Samuel, 3, also spent time with his mom, Christine, in Los Angeles, while Garner, 43, was in Montreal shooting her upcoming film Nine Lives, adds another source.

RELATED VIDEO: Ben Affleck and Jennifer Garner’s Rep Confirms Split

“He is really leaning on his mother for support,” says the insider. “Ben and his mom have always been very close.”

The actor, 42, also turned to his mother after his highly publicized split from ex-fiancée Jennifer Lopez.

Reporting LIZ MCNEIL