deal with your pain. if youre not attracted to her, youre not. you dont owe her anything.
but you do owe it to yourself to deal with the hurt and forgive her, for you.
It's natural to be protective of our hearts.... maybe it's not that you're not attracted to her anymore. Perhaps you are just retreating to safe zone where you don't allow yourself to be close enough to be damaged. It is possible to, if she's willing, to shift your focus to a new type of relationship.... a friend. "the basis of all metaphysics is friendship."
You went out with someone before you were "over" the last one. It's only been a week since you were with the girl you loved? Sheesh. Hearts and emotions don't recover that quickly.
Then it sounds like you are going to be using women to make yourself feel better, when there's no chance you are actually going to have feelings for them. It will do you good to stand on your own for a bit. Or hang around with friends. Don't use women.