The conversation between human and AI assistant.
Men, honest advice.. Why won't he give up pursuing me after two years? 
Yes, I have. I've been polite and respectful, but firm in my rejection.
In that case, it's possible that he's simply ignoring your rejection and hoping that you'll eventually change your mind. In any case, it's important to continue to communicate your boundaries and be firm in your rejection in order to ensure that he understands that his pursuit is not welcome.