Simba usually didn't like it when Tanga acted more royally towards his family and him in particular, but when Tanga asked about Nala Simba got completely distracted from that. "I... She's still asleep, and I was thirsty..." he said, hoping that the excuse was good enough to keep Tanga from asking any further. He hated not telling the truth, but he also didn't want anybody knowing about the fact that he was avoiding Nala on purpose. Surely he would have felt more open to talk to Tanga about it if he had known that Tanga was avoiding Marini for the exact same reasons.
When Tanga somewhat described the reasons for what he was doing all out on his own, Simba wasn't even suspecting that they were both pretty much in the same situation. But since he wasn't figuring that out yet, he couldn't help but wonder what was disturbing his friend so much, and more importantly why was it making him become so distant from his best friend. "Anything you feel like talking about?" he knew that Marini and Tanga could sometime be even more inseparable than him and Nala, until recently at least, and that Tanga would feel a lot more open when he was talking to Marini, but right now he was avoiding her.
---
Marini, despite having been waiting for Nala to wake up, was so deep in her thoughts that she failed to notice Nala quietly walking over to her. "Oh, uh, hey Nala." she said looking up at her friend with a slight smile. "Simba? I almost never wake up before he does... Maybe he's with Mufasa?" but normally whenever Simba knew he was going to spend a day or part of it with Mufasa he would inform Nala about it, and since Nala didn't know where he was, then he had either forgotten to let her know or he was somewhere else.
Marini hoped that her growing depression wasn't too noticeable, but she knew it was. As much as she wanted to talk to someone about it and maybe finally get some answers, she also felt the other way around. She never felt more alone since the first few days after her mother died, right before she and Tanga became friends. Now that he was so distant from her, it was like experiencing the same thing all over again, and she hated it.