I think Pogba thought Real would come in hard for him, and they haven't. And now suddenly we're nearing the end of the transfer window and Real still haven't even submitted an actual offer, let alone a realistic offer that United might accept. And so he's starting to get nervous. He doesn't want another year outside the Champions League, Raiola has sold him another huge move - cementing his place as a world superstar. Only Perez and the board don't really think he's all that, and now Pogba is starting to worry that it's not going to happen.
And honestly, I don't think it will happen. Real can't afford his transfer or wages unless they get rid of Bale and/or James, only Zizou really wants him and his future is already uncertain, and Pogba is United's biggest star and Woodward and Ole have no desire whatsoever to sell.