Courteney Cox says she and David Arquette are still working on their marriage.

“This is a pretty private matter that’s been made pretty public. But it’s our own fault,” Cox said this morning on Live with Regis and Kelly. “David and I are both pretty open. He’s really open. What are you going to do?”

“We have a great handle on it. We’re really close. He’s my best friend. We’re putting Coco, obviously, first. At first it wasn’t quite as easy. When you first get separated, David had a lot of acting out. He’s over 100 days sober. He’s really gotten it together. At first it was a little rough. Now we’re able to actually look at the relationship to see if we’re compatible. We know we love each other, but how does the rest of it work?”

As for the new Scream 4 movie, which also stars Arquette, Cox said the films have played a part in her marriage, “The first one we fell in love. The second one I hated him. The third one we got married. And this one, we started off having problems in the marriage.”

Last night, she told David Letterman that Arquette to “hit on” her during a recent trip to Disney World. “I told him, not right now. You don’t have the Fast Pass right now. Not for that ride.”