How Do I Reject A Guy?

I met a guy a few weeks ago, and he seemed fairly clingy. He asked me out the second day that I had met him, and to be honest, I didn’t want to date him. I told him no, and he said ok.

The next day he sent me an email message asking if we could hang out and if I could call him. I told him that I was busy over the summer so that wouldn’t be an option.

Since then He has come to my house and looked through my windows. He has also insisted that we get to know each other better in case we do date, even though I said no. He doesn’t seem to be taking the hint to go away. He has asked for phone numbers from a few of my friends so that he can call me. Luckly, all of my friends have refused.

I have no idea how to get rid of this guy without hurting his feelings, or being shallow. If anyone could give my any suggestions on how to tell him kindly to go away, it would be appreciated.