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The 26-year-old actor told the British paper that his 14-month romance with his Wall Street: Money Never Sleeps costar ended in October 2010 because of her obvious desire to get married and have children.
And although Mulligan and LaBeouf did not make it down the altar, the actress went on to fall in love with English folk rocker Marcus Mumford -- whom she married in April in an intimate ceremony attended by friends Colin Firth and Adele.
"She's happy as hell right now and we wouldn't have been able to make it like that," LaBeouf told the Sunday Times magazine. "She was chasing marriage, family, kids more than I was."
Despite the fact that they ended their relationship, LaBeouf, who is currently dating fashion designer Karolyn Pho, has nothing but praise for his ex-girlfriend.
"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," he said. "We were always traveling and had sensibility differences that weren't conducive to living with one another."