The 44-year-old actor - who raises six children with partner Angelina Jolie - admits starring as an elderly man who ages backwards in The Curious Case of Benjamin Button inspired him to re-evaluate his priorities in life.
He said: "Angelina and I do not fight anymore. What occurred to me on this film, and also with the passing of Angelina's mother Marcheline Bertrand last year, is that there's going to come a time when I'm not going to get to be with this person anymore.
"I'm not going to get to be with my children anymore. And so, if we have a flare-up, it evaporates now. I don't want to waste time being angry at someone I love."
Brad added he loves raising such a large brood because he deals with something different every day.
He said: "I have this fantasy of my older days, painting or sculpting or making things. But right now, it's about getting the work done and getting home to family. I have an adventure every morning getting up."
Brad also revealed his favourite movie role was in 2005's 'Mr. and Mrs. Smith', because it was when he met Angelina.
Explaining his decision, he told Rolling Stone magazine: "Because you know. six kids. Because I fell in love."