First thing I'd do is get as far away from this chick as possible! No contact! Done! By staying and trying to accept what she did and what a failure you are in her eyes, you will only create more pain and this pain will be difficult to undo because you'll start accepting shit that no man should. And if you stayed she will make you accept it more which is just as scary if you know what i mean. Some chicks like this type of power.

Take some time for yourself to get over her and the situation. The sun will shine again. Then start looking into advancing your own sexuality. Like big al said, don't use her as a reason for your PE. You dont want any of those attachments.