Why do you answer what others say, and then you don't want to say it?

When you want to answer someone's question, the answer is said in your mind once, and you don't want to say it again. This situation is actually a very bad habit, because it may make others misunderstand that you think you are indifferent or disdainful to answer their questions. For you, your social contact is still very big and fast. I can only say that it is because of some reasons in my heart.