IN vanity fair interview with robert pattinson..he talks about kristen stewart: “Kristen is very focused on being an actress,” Pattinson says,  “I mean, that’s what she is-she’s an actress. Whereas I-I just don’t really know.” “Are you asking me if I’m really a vampire?,” Pattinson says, laughing, when I join the nosy chorus, asking if his on-screen love mirrors his relationship in real-life.…