Scarlett Johansson hints at what really ended her marriage to Ryan Reynolds.

When Scarlett Johansson, 31, married Ryan Reynolds, 39, I was like, “Who is he? That guy from Two Guys, a Girl, and a Pizza Place? Huh. Cool.” And then I never thought about it again.

It seems though, that this kind of reaction could have had at least something to do with why the couple broke up in 2011.

By 2011, Scarlett Johansson had starred in 30 films, been named the sexiest woman alive by various magazines and released two albums.

Her husband Ryan Reynolds’ film career was burgeoning, but at that stage, his biggest role was probably Van Wilder: Party Liaison. It’s fair to say Johansson was the bigger star of the two.

“The logistics of being with another actor are challenging,” she told Cosmopolitan.

Scarlett is on Cosmo's US May cover.

"There has to be a real understanding of how you share your time, especially when two people's careers are going at the same rate."

Johansson hasn't specifically mentioned Reynolds, but she's very probably speaking about her relationship with him.

"Or even if one person is more successful than the other, that also proves challenging. There may be a competitive thing," she said.

Scarlett Johansson is now married to Romain Dauriac.

When they got married in 2008, Johansson was Woody Allen's latest muse, she'd become a darling of indie cinema in the excellent Lost in Translation with Bill Murray, and she was about to become Black Widow in Iron Man 2.

Reynolds is experiencing his greatest success only now, with the release of Deadpool.

Was Ryan Reynolds' biggest lie "I'm happy for your success"? Post continues after video.

Since their divorce in 2011, Johansson has married French art collector Romain Dauriac, and they have a daughter, Rose. Reynolds married actress Blake Lively, and they also have a little girl, called James.

Ryan Reynolds and Blake Lively.

Johansson spoke on the same topic last year in Parade magazine.

"[Marriage] takes a lot of work. It takes a man who's not only confident in the love that you have for one another, but confident in what he has going on in his own career. He has to be in a field that's completely different from yours. My husband's also involved in art. What's important to him is the recognition that he gets from his job, and that has nothing to do with my job."