Sam Worthington and Natalie MarkActor Sam Worthington, best known for his roles in 'Avatar' and 'Terminator: Salvation,' has split from longtime girlfriend Natalie Mark.

According to the Herald Sun, Worthington, 34, recently split from fashion stylist Mark, his girlfriend of nearly three years. The couple has not been seen out together since last October, and a source close to the couple wasn't surprised to hear about the split.

The source is quoted as saying, "It's been in the cards for a while, I believe."

And it seems that Worthington may not be taking the split too well. The Herald Sun also reports that eyewitnesses at an annual Australian "G-day" event held in Los Angeles were shocked by the actor's aggressive behavior.