The hunky actor has credited his 'The Paperboy' co-star - who is a doting husband and father to three children - with sitting him down and helping him realise there's more to work than making back-to-back movies.
Zac told GLAMOUR magazine: ''During filming, Matthew and I had a lot of time to talk. We talked about life. He got me thinking, because for the past few years, I've been so focused on movies and work. I guess I'm compulsive like that.
''Matthew was the first person to sit me down like a big brother and say, 'Are you happy? What do you want to do with your life, man?' He'd say, 'Let's go do something fun today.' All I'm thinking is, 'Let's go rehearse!' I realised that there was something else I wasn't tuned in to.''
One thing that keeps Zac grounded is a good workout, and he often hits the gym to lift weights.
The 26-year-old star said: ''That's my thing. It's part of my life. It's what I do and always have done.''
Zac also enjoys taking trips to remote locations by himself.
He added: ''I like to sneak off to really remote places in the world and just chill. I kind of feel that travelling is how I'm able to stay real and grounded.''
'The Art Of The Deal' how you've never seen it before.
Shot on a plane in zero gravity, the video features OK Go's usual levels of choreography with a few surprises thrown in for good measure!
The Boss will release his memoirs via hardback, audiobook and e-reader on September 27th 2016, and reportedly secured a $10 million advance.
His wife is on the warpath now.