Anatol Wasilewski
Anatol Wasilewski voted up Corey The Goofyhawk's answer
Which is the best way to break up with someone? Text? In Person? A letter? Email? Voice Mail? Have a friend tell them? Complete avoidance until they figure it out? Restraining order?

Always break up face to face. You two may have your problems, but the other person still deserves the respect of a face to face encounter. Best of luck to you!