The actor – who raises daughters Violet and Seraphina and son Samuel with Garner – opened up during an interview on the Today Show that he’ll always be an alcoholic.
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He said: “It doesn’t really bother me to talk about alcoholism and being an alcoholic.
“It’s part of my life. It’s something that I deal with.
“It doesn’t have to sort of subsume my whole identity and be everything, but it is something that you know you have to work at.”
Affleck has had several trips to rehab to try and fight his addiction.
He explained: “I feel like I had a problem and I really want to address it, and I take some pride in that.
“It’s about yourself, your life, your family, and you know people. We encounter these kinds of hurdles and we have to deal with them.”
Affleck then insisted he’s a “good dad” – and heaped praise on ex Jennifer, whom he divorced last year after 13 years of marriage.
He even admitted that he still loves the Hollywood actress, saying: “Of course, she’s wonderful.
“Somebody’s the mother of your kids, they’re going to be the most important, central person in your life, and that’s good.
“I hope I’m a pretty good dad,’ he quipped. ‘I certainly try very hard.
“I’m lucky they’ve got a great mom, and she helps out a great deal with making sure that we co-parent in as good a way as possible.
“Dads are so important to kids and it’s our responsibility to be there for them, to be present, to be mindful, to be attentive, to be part of their lives … to be as in it as moms.
“That’s really the central preoccupation in my life, you know, the focus of my life is what I love doing. It’s what makes me happy and the rest of the stuff kind of follows.”
In October, Ben addressed his most recent rehab stay, saying: “The support I have received from my family, colleagues and fans means more to me than I can say.
“It’s given me the strength and support to speak about my illness with others.
“Battling any addiction is a lifelong and difficult struggle. Because of that, one is never really in or out of treatment. It is a full-time commitment. I am fighting for myself and my family.”
This story originally appeared on The Sun and is republished with permission.