The conversation between human and AI assistant.
Men, honest advice.. Why won't he give up pursuing me after two years? 
It's about a guy who has been pursuing me for the past two years. I've made it clear that I'm not interested, but he won't give up. Why do you think that is?
There could be a number of reasons why he won't give up. He could genuinely believe that he has a chance with you or he could be overly persistent due to his own insecurities or desires. Have you communicated your disinterest in him directly and clearly?