I had to call the cops on my ex-boyfriend last Thursday:

Stop looking at me like I did something to you.
I have campus police on speed dial, if you do not leave, I will call them.
You need to stop pretending like I did something wrong to you.
I am dialing the number right now.
Look at me. Look at me! Stop looking at me like you're a victim! I didn't do anything wrong to you. I don't deserve this.
Look, it's ringing. You need to leave.
First, you need to stop looking at me like I did something wrong to you.
No. Leave.
Look at me!
Leave.

You feel a special kind of guilty when you have a stalker. You don't want to believe that someone you ever loved would to this. You really don't want to believe that someone you were ever intimate with, or someone who has pictures that you painted for them in their room would do this to you. You don't want to feel vulnerable. And you really don't want to feel that every few seconds, you need to be looking over your shoulder for them. You just want them to leave you alone.