How to judge whether a person says he misses you in a text message is true or false? Does taking a long time to text back mean that he doesn't care about you as much as he says?

You can judge his mood at that time based on the tone of the text message he sent you. A man is in a very bad mood when he is thinking about his girlfriend. If you feel that his mood at that time is really not good enough, maybe He really misses you. Sometimes he doesn’t reply to text messages for a long time. There are also many other reasons, such as he is busy, or the signal is not good, how long does it take before he receives the message, or does not hear it, etc. If it often takes a long time for him to text you , maybe he does, as you said, not care about you that much. I wish you happiness