Jonathan Bricklin and Susan Sarandon
10/23/2012 at 08:00 AM EDT
Susan Sarandon, who famously lived and raised a family with her longtime former partner
, actor Tim Robbins, says marriage just isn't her thing.
"I believe in it for other people. I think if it works for you, that's fabulous," the Oscar winner, 66
, tells Katie Couric on Tuesday's Katie show
. "I don't know, I was always hesitant … this idea of locking it in. I thought it would make it less spontaneous."
Sarandon, who was married in college to actor Chris Sarandon, has been rumored to be involved with her business partner
in the New York city ping pong bar SPiN, Jonathan Bricklin, who is more than 30 years her junior. He has denied a romantic relationship, and says the two are simply friends.
On the show, she said that she and Robbins, 54, were definitely committed. (Living together from 1998 until their split in 2009
, they raised sons Miles and Jack. Sarandon also is the mother of actress Eva Amurri
, 27, whose father is Italian film director Franco Amurri.)
"We had kids and property. You can't get more committed than that," she said about Robbins. "We had a lot of great things going on but for me, personally, maybe it's growing up a hippie at the time that I did."
Sarandon said she's always been a one-man woman, noting she's dated actors and those in entertainment business because the profession forces people to open up to one another quickly.
"I think that's why actors are always with people from some aspect of the business because there is nothing sexier than having a project with someone – not necessarily an actor – that's probably the weakest choice you can make. But when you work on something you find out so much, in this business especially," she tells Couric.
"Very quickly you see the worst and the best and there's nothing in between."