David Arquette and Courteney Cox have now been divorced for nearly as long as they were married, but they’re still friends. “We get on really well,” the 51-year-old tells In Touch of his ex, 58. He credits their daughter, Coco, 18, for inspiring them to keep their relationship amicable — and divorce has actually brought them closer together. “We’re better now than when we were [at the end of our marriage],” Courteney has said. (The actor also shares sons Charlie, 8, and Gus, 6, with his producer wife of nearly eight years, Christina McLarty.) Here, David, who recently hosted a gala for the Healthy Humor children’s charity at his popular LA club, Bootsy Bellows, talks to In Touch’s Natalie Posner about Courteney, becoming an honorary Red Nose Doc, and how…