I just got off the phone with her.
In the best way that I could, I told her it was best that the break-up came now instead of later when things got more involved. The inevitable question came as to "why?"
And the answer I gave was that I just don't see the relationship in the long haul. And that I was sorry it had to end in the manner it did, that I'm a prick for not breaking up with her in a more proper way. She is a special person and that I wanted it to work, but I didn't think it was fair for me or her to continue a relationship that wasn't going to go the distance.
She still weren't too happy, but she accepted this and there is closure.