I have a good relationship with a male colleague and like him a little. I sent him a message once and he didn't reply, and he didn't reply after a day. Can I just ask him why he didn't reply?

Yes! Just communicate sincerely! The principle of sincere communication The so-called sincere communication refers to sincere communication, sincere attitude, and no hypocrisy. It can be said that sincerity is a lofty moral emotion, the foundation of being a man, the premise of communication and the basis of winning people's trust and pure friendship. Have you done anything wrong yourself? You ask him, which means you care about him more, and he doesn't reply to you, which means he doesn't care or forget! Ask you if you want it! Don't be afraid, just stay together if it is suitable, and we can't help it if it is not suitable!