I understand your feeling. To be honest, my breakup is perhaps a lot more easier than yours, because I was left with no hopes.
It's crazy how we tend to cling to hopes and cuddle it. I'd say nothing's wrong with that, but we do have to prepare for the worst with our utmost conscience and rationality.
I'm glad there's no such thing like some horny teenager instinct left in me. But I know that you are a good guy, and that you know for sure what is right to be done, and what would make you feel even more humiliated.
Good luck my friend.