how many times do you have to say go away before a person really goes away?

I am a stubborn person. This is what I have learned recently. Oh, and I hate clingy people.

Go away, go leave me alone I said to a friend that was getting too clingy and possessive. He looked at me with a forelorn look and inched closer, Look I! let me explain!

As he tried to follow me around, I gave him a frosty stare at him and ran.
I never had anyone chase after me like that.
It's very unsettling.

We are learning things we shoud've learned in junior high.

Guys are so annoying.