Butler, 43, said he hopes that he will eventually meet the right woman, reported Sun online.
Quizzed whether he is in a serious relationship, the actor said, "Not at the moment. But at some point I do want to settle down."
The couple began seeing each other in May 2012 after the 25-year-old beauty split from Hollywood star Leonardo Dicaprio.
Butler has previously been linked to a string of beauties including co-stars Jennifer Aniston and Jessica Biel, as well as reality TV star Brandi Glanville.