The movie heavyweight and Affleck became good friends on the Daredevil set and Duncan went out of his way to keep his pal's romance with castmate Garner a secret.
But he was devastated when his former colleagues didn't let him in on their summer 2005 marriage plans.
He says, "We were real good friends and then all of a sudden he gets with Jennifer Garner and I don't get a call.
"I saw it coming from when we started shooting; I could have broke the story to People a long time ago. I could've made a lot of little loot (sic) but I didn't because I considered him a friend."