The couple, who have not been photographed together in three months, decided to part ways after celebrating America's Independence Day separately, reported Daily Mirror.
"It's not like George and Stacy couldn't find time to get together if they really wanted to. George is quietly backing away from the relationship. It's always the same. As soon as he feels a woman is getting too close he pulls back," a source said.
A spokesperson for the 52-year-old 'Descendants' star, who spent the holiday with friends at his lavish Lake Como home in Italy, refused to comment but friends close to the couple insist they are still going strong despite spending a lot of time apart in recent months.
Clooney has been dating 32-year-old Keibler for the past two years.
