Last October, the 47-year-old actor completed his 40-day stay at a treatment center for alcohol addiction in Malibu, California, but remained in outpatient care. Since then, he's been spotted hitting the gym as well as enjoying family outings with Garner and their three kids -- 13-year-old Violet, 10-year-old Seraphina and 7-year-old Samuel -- though he and Garner officially divorced after his third rehab stint.
"Ben's finally turned a corner and is working hard to stay dedicated to his sobriety," the source says. "He's still in the program. He knows the importance of making his sobriety a priority while planning his next step in life."
"He's in a better place in his life and recovery," the source continues. "He wants to be the best he can be. He can come home at night and hear his own thoughts. Those closest to him are proud of his progress."
As for his relationship with 47-year-old Garner, the source says the two are still on great terms, especially when it comes to co-parenting.
"Ben's relationship with Jen is doing amazingly well despite everything that's happened," the source says. "She's really supportive of Ben, and when they parent the kids separately, they both share their stories of sweet moments they had with the kids that day. Their friends are always saying what a perfect example they are of dedicated parents who look past their own issues."
"Battling any addiction is a lifelong and difficult struggle," he said in a statement on his Instagram. "Because of that one is never really in or out of treatment. It is a lifelong commitment. I am fighting for myself and my family. So many people have reached out on social media and spoke about their own journeys with addiction. To those people I want to say thank you. Your strength and courage is inspiring and is supporting me in ways I didn't think was possible. It helps to know I am not alone."
"As I've had to remind myself, if you have a problem, getting help is a sign of wisdom and strength, not weakness or failure," he continued. "With acceptance and humility, I continue to avail myself with the help of so many people and I am grateful to all those who are there for me. I hope down the road I can offer an example to others who are struggling."
Meanwhile, Affleck also has an exciting new project coming up, reuniting with his bestie, Matt Damon, on the thriller The Last Duel, a tale of revenge centering on duelers in 14th century France. The project, which will be directed by Ridley Scott, is the first film the pair has taken on in a starring capacity since Dogma in 1999.