Breaking up over the phone is, uh, for cowards. Doing it over the Internets makes you an even bigger wuss.
My philosophy is, once it's over, it's over. Your relationship won't ever go back to the way it once was. So if it ever comes to that, do it in person and let the other party know how serious you are about the whole notion.
Oh, the name's Buck by the way, pleased to meet all of ya.