How to reject a CREEPY guy PROPERLY?

Anonymous
I've met my share of guys who have confessed to me but they were my friends- someone I actually knew. But I never had a guy ask me to be his girlfriend. But a few days ago, a STRANGER asked me straight up. When I told him no, but he just kept pushing. How do you say no when they're pushy, you're not interested, and still want to be nice? I tried to nicely reject him but he took it as a challenge to even try harder? How do I give him the message that I want him to stop right then and there because I'm just not interested in having a relationship? This guy was really creepy and he scared me and he was asking too many personal questions even though he just came up to me 5 minutes before. Is there no way to break it down nicely to a desperate guy?

um, additional info- the guy got my number from one of my friends and he's been calling me and texting me (I only replied once), tried to add me on Facebook (ut I didn't confirm him) and he even followed me back to my dorm beside my university when I tried to walk away from him. Also, when I told him that I he was a nice guy and I can't be his girlfriend but I was sure he'd find one and that he should know the girl first before asking her to be his girlfriend, he just replied, "well, that's too bad because my dad allowed me to have one now.." and so I told him that we could be friends because I didn't want to hurt him.

HELP?!?! this desperate guy is making me desperate to stay away from him..
How to reject a CREEPY guy PROPERLY?
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