The 61-year-old actor said, though they both did not have a conversation for a long time now, he is still very good friends with her, reported Entertainment Tonight.
"She seems OK, you know, OK to me when I talk to (her)," Thornton said at a press junket for his latest film, "Bad Santa 2".
"I don't talk to her that often though. You know? We're still very good friends but she's got her world. I've got mine," he added.
They separated in June 2002 and divorced the following year.
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"Once in a blue moon we come together. Every now and then we talk, you know? Whatever. But when people are going through their trials and tribulations I try to leave them alone unless they want to talk to me," he said.
"In other words, I figure it's none of my business. Unless someone makes it my business it's none of my business."
When asked if he will always be there for Jolie when she calls, he said, "Of course.