How do I break up with a crazy girl?!

MrGentleman
Dear readers,

I am an-all around nice guy. I am a college student and am quite popular with the ladies. However, a recent girlfriend of mine hates it when other girls call me. One time, we were walking out of class and I spoke to a female friend of mine that she did not know. When this occurred, my girlfriend blew up! She smacked me in the face and threatened to kill me if I ever cheated. I did absolutely nothing in return. She is the extreme jealous type and even hates for me to speak to girls I have been friends with for years. However, I am not interested in any other girls and only have eyes for her. I even left a more attractive girl who is planning to go to Princeton after she graduates for her. I really like her, but this situation is getting out of hand.

I need advice! Please tell me what I should do.

-A very nice guy
How do I break up with a crazy girl?!
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