Shia LaBeouf has revealed that he and Carey Mulligan's break-up happened because of their incompatible lifestyles.
LaBeouf dated his Wall Street: Money Never Sleeps co-star for just over a year before they separated in October 2010.
The actor admitted that he didn't think their relationship would have lasted as they are such different people.
He told The Sunday Times: "Carey is not just an actress, she is a great human being, a sweet girl and super intelligent.
"Our thing came down to not having compatible work/lifestyles. We were always travelling, and had sensibility differences that weren't conducive to living with one another.
"I'm harder on myself and my surroundings than she is, and we had a culture shock in terms of meeting her parents and vice versa . . . sensibilities, cultures, histories. There were differences, that's all."
LaBeouf added that he is happy for his ex-girlfriend, who married singer Marcus Mumford of Mumford and Sons in April of this year.
He said: "She's happy as hell right now, and we wouldn't have been able to make it like that. She was chasing marriage, family, kids more than I was.
"I'm not opposed to marriage. I just think I'm quite young. I come from divorce. I'm only doing marriage once. It's not a game for me. I'm not a religious person, but I have ethics."
