I have not been replying his past few mails. He was still writing. After reading Savante's comments, I felt a little sorry for this guy. I certainly hope that he would not do something stupid. Besides what he wrote reminded me of what happened to myself 4 years ago. It took me a long while to get over and out of it.
So I decided to write to him.
"I am still here. I was busy. I want you to know that if you need someone to talk to I can listen to what you have to say. I would not judge you. That way, maybe, you can let your past come to rest. You can then move on with your life. I prefer to talk to you face to face, not in this manner through the mails. You can experience how inconvenient mails are. You cannot get me and thought that I was angry when in actual fact I was busy. You already know who I am. If you think that I am a decent person, let us meet. Any other things can be discussed then. I wish you well and a good week ahead."