|Scarlett Johansson and Ryan Reynolds|
The 27-year-old actress wed the 'Green Lantern' star in 2008, and although they split in December 2010, Scarlett is not regretful as she felt it was "instinct" to set up a home with him.
She said: "It was the best thing I ever did. I'm a big believer that when something feels right, you should do it.
"I'm a big believer in instinct. Getting married was the right thing to do because it was natural. It grew out of romance and love and a desire to have a future with somebody, and I was very fortunate that I married somebody who turned out to be the person I thought he would be."
However, the 'Avengers' beauty admits the pair spent a lot of time away from one another and she was not prepared to do the work necessary to keep their romance alive.
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In an interview with America's Cosmopolitan magazine, she said: "Relationships are complicated. Being married is a living, breathing process. I think I was not fully aware of the peaks and the valleys. I wasn't prepared to hunker down and do the work.
"Both of us were extremely busy. We spent so much time apart. It's very difficult."
Scarlett – who dated Sean Penn for five months following her break-up with Ryan – recently admitted she likes a "bad boy" in a relationship.
She said: "I'm attracted to the quality of being adventurous and perhaps a bit mischievous. And also questioning authority and being proactive. If that makes up a quintessential bad boy, then whatever."