A pal told In Touch, "George is relieved to be single again. He thinks Sarah is sweet and that is why it was so hard to break up with her."
"The truth is they had little in common and he just doesn't want to be tied down."
Another pal told People that Larson had recently moved out of the star's LA home.
Clooney's agent has refused to confirm whether the couple have split or are still together.