Kylie Jenner and longtime best friend Anastasia “Stassie” Karanikolaou may not be as inseparable as they once were — but there’s no bad blood between the pair. “Kylie and Stassie are still friends. There hasn’t been some big falling out or anything like that,” a source told Page Six exclusively. “They actually traveled together pretty recently. They just haven’t been hanging out as much as they used to.” The clarification comes after Karanikolaou, 29, raised eyebrows when she skipped Jenner’s 29th birthday celebration over the weekend to vacation in Ibiza with influencer Alix Earle, 25. Her absence quickly sparked speculation among fans…