Most Helpful Girl
Anything you could do that would make her break up with you is gonna be a lot meaner and more hurtful to her than just being honest about whatever it is that makes you want to break up. Tell her she's a wonderful person and whoever ends up with her will be a lucky man, but there just isn't a spark there or whatever.
Most Helpful Guy
By cutting off and stopping all contact and keep ignoring her until she's ready to give up on you and break up with you?
I think it's still best to just man up and tell her bluntly the truth about hiw and what you feel about your relationship with her and that you have decided that you absolutely do not have the desire or interest to be with her anymore face to face. I mean since it's impossible to not hurt someone when breaking up either way. Tell her it's the honest truth and that you don't want to lie to her or yourself anymore ir waste any more of her time as well as yours and just wish her best of luck as you two go your separate ways from here on out.