He said he sent me a message as soon as he woke up, but I knew it wasn't. Why did he lie to me?

He wants to win your favor, but he doesn't want to make real efforts. He thinks you will believe his lies. Generally, people who want to achieve their goals through lies are selfish, macho, unsympathetic and superficial. If you marry such a man in the future, he will treat you as a nanny. He is an uncle. It is impossible for you to let him pity you in his world. He only has himself and his own interests.