cyclec, I don't know your whole story, but this is a good question... .
Where I need help/advice/input, please: The "relationship" is long distance at the moment. Has anyone been in a similar position?  :)id you end it over the phone, in text, or how? Then once you did, did you go cold turkey?
I've been in long distance relationships or phases... . but never actually been the one to end any relationship (at least so far!)
Communicating anything serious in a relationship, I personally feel like the more direct the communications are, the better, which would prioritize it face-to-face first, voice second, and email/txt third. So much of our communications are non-verbal... . the more of that you include, the more sincere, open, and effective communications are.
But you also have to consider what you are capable of, and what it is worth. I wouldn't arrange a face-to-face meeting to break up. As Laelle said, she knew she couldn't do it by voice. Know yourself and choose appropriately.
The other question is what message do you want to convey?
I've been involved with a business/non-profit "breakup" and the best message I wanted to convey was a simple one:
"I'm done, I give up. I can't do this anymore." With a possible addition of "I wish it didn't have to be this way."
I figure that the "You did... . " "You didn't... . " "If only you had... . " "I had to do this because you... . " type statements are unkind and unnecessary.