The 48-year-old actor - who is dating MTV Italy presenter Elisabetta Canalis - created a set of rules which he believed would help his `Up In The Air` co-star Anna Kendrick, 24, including banning her from romancing older men.
Anna explained: "He had rules for me about dating and stuff. It was really sweet. It`s funny, actually. A friend of his that was his age was dating somebody younger than me. He thought that was fine. I was like, `What would you say to me if I were dating somebody your age?` He said, `Oh no, absolutely not.`
"He had this kind of older brother thing with me."
The actress also revealed her favourite scenes with George were the ones where she got to take out all her former relationship frustrations out on him.
She explained: "I loved yelling at George. I loved telling George off. I loved telling George that he was a 12 year old. I was so looking forward to that scene almost to the extent that I was concerned that it was going to be a kind of indulgent thing. It`s like every ex-boyfriend I have ever had in the form of GeorgeClooney on a boardwalk. It was a lot of fun."