First, you think too much. The first situation is that you think too much. Maybe you are a sensitive person and care too much about other people's words and deeds. Maybe the other person just reduced the frequency of talking to you, and you think the other person doesn't like talking to you. In fact, sometimes you don't care too much about what others think. Focus on yourself first, and maybe you won't be so worried.
Second, the other party is busy with their own affairs. It may be that the other person is busy with his own business these days, which reduces the frequency of chatting with you. If the other person doesn't clearly express his dissatisfaction with you, you can try to communicate with the other person to see if there is any misunderstanding or something wrong. Everything can be solved naturally after communication.
Third, the other party thinks that you are not suitable to be friends. Maybe the other person didn't fully understand your personality at first, and thought you two hit it off and were suitable for being friends. But after getting along for a period of time, you feel that your personalities don't get along very well, so it doesn't matter if you are naturally alienated. Do not deny yourself. Everyone has his own personality, and it is normal to get along with one person. Just find other friends.