you can always do what men have been doing for many year
just forget her and move on
ignore her calls, if she happens to call private and you pick up. just say you have been busy, and you will TRY to make time soon.
THE THING IS, women are very, very emotional. When you break up in person it cant be said how they will react, in any event they most likely WILL NOT ACCEPT THE BREAK UP. Its just a waste of time, or a way for THEM to "fix" the situation.
When you think about it. what do you want to say in person or on the phone?
"things aren't working out between us"
"we need to talk"
"it not you, its me"
Anything you say or do WILL be used against you. so why not do nothing!
I have broken enough hearts to know, the way to go
the Duke