First of all, what do you mean by this word?
Wang that anxiety, obsessive thoughts, fear. It is impossible to answer unequivocally. there is little input data, but since 95% of urban residents are neurotics I would advise you to read the symptoms of neurotic states. And there it will already be more visible.
Try to turn on the brain. Well, for example, it seems to you that N. is following you. Think about the fact that this person has a job, a family, some kind of personal life, and so on, just imagine this person's day. Then it will be easier for you to understand that he is not able to devote as much time to you as you think. So it is in other situations. Always think - why is it? Are you the star of the screens? Are you rich? Who might need to chase you? The answer usually suggests itself