I met a man at a running club about 6 years ago. He seemed to develop an obsession with me. I have been in a relationship for 5 months and this man does not know I am no longer single. I am getting annoyed now as he is messaging me daily. I leave it 24 hours to reply but he is not getting the message. I have never been romantically interested and never will. I love my boyfriend very much. Why do men not get the message and act desperate? I wish he would leave me alone.