The couple declared they were isolating following 10 years of marriage in March 2016.
Affleck and Phoenix wedded in 2006 in the wake of getting to be noticeably occupied with 2003.
Casey and Summer were introduced to each other by the latter's brother in the mid-1990s. The couple has 2 sons - 13-year-old IN and 9-year-old Atticus. A source further told the magazine that Casey and Summer both went to couple's counseling sessions, but the conversations with the therapist did not work in their relationship's favor.
Affleck, who turns 42 on August 12, is the younger brother of film star Ben Affleck. If she asks for the custody of their two children, the actress also requires maintenance.
Summer filed the divorce petition Monday in Los Angeles. citing irreconcilable differences.
At the Golden Globes this past January, Casey gave Summer a sweet shout out during his acceptance speech for Best Actor in Manchester By the Sea.
An earlier report from In Touch magazine suggested that Summer was having trust issues when the reports surfaced that her husband of nearly ten years was having an affair. "They remain very close friends", the statement said.
Since then, Casey has displayed with Floriana Lima... especially for the Oscars.