If you are still at school (like me), you can ask other female students to help you observe whether he likes you (or you can observe it quietly yourself). If you notice that he may like you and you have no feelings for him, don't say anything too irritating to him, such as "You are so annoying" and "You are so annoying!" "Will you stay away from me?" Ask him why he is talking to you. If the reason is acceptable, it doesn't matter. Tell him not to do that in the future, okay? It's done.