A female colleague and a male colleague confessed, but the male colleague didn't promise him, and then he stopped talking. What happened?

Obviously, both of them are ordinary people. Only a few people can easily become friends after failing to express their love. They're not embarrassed at all. Maybe they are thick-skinned and don't speak normally. These days, they have become strangers. In a few days, I will become a simple colleague, and then every day is full of work.