I've always been the one to do the breaking up, and it was never very clean or gracious. Let's just say that each time the other person wasn't interested in accepting or understanding what I had to say, so I went with the thing with which I'm most comfortable - writing, of course. :/ I'm not proud of it, and have never really felt very good about it.
I don't know, though... When it comes down to it, break-ups (at least of long-term relationships) are kind of like death: No matter the circumstances surrounding them, and no matter how they take place, it's always crummy.