David Fincher may have had his suspicions of Ben Affleck and the type of husband he would make given his "duplicitous" nature.

Fincher revealed a few character traits about his "Gone Girl" star in the film's commentary that could make sense of his recent split from wife Jennifer Garner, according to the New York Daily News.

"If I was his wife, I think I would be very suspicious, always, of whoever just called because he has a real gift at being able to insinuate a conversation," the director said with a laugh in the commentary.

The 52-year-old Fincher also noticed Affleck's ease in creating a phone conversation for a scene.

"This is something that Ben is extraordinarily good at, when he has to cook up a phone conversation, when he has to hear somebody on the other end of the phone," he said.

The director added, "He has to do these things in the foreground where he takes out his phone and looks at it and he puts it away so his sister doesn't see it. There are people who do that and it's too pointed. But Ben is very, very subtle and there's a kind of indirectness to the way he can do those things."

Affleck reportedly admitted his infidelity to Garner during their 10 years of marriage. She kicked him out of their Pacific Palisades home "but eventually decided to forgive him," an insider told Us Weekly.

They announced their divorce on June 30, one day after celebrating their wedding anniversary. The 42-year-old actor is now living in the couple's guest house on their Brentwood property in Los Angeles.