My dear, if she really loves you and is worthy of your love, she will admit that she was wrong, too, forgive you, and come back. I hope that she's the right person for you. If she is, she'll want to become a better person for love of you and in order to not hurt you anymore. Nothing like love to inspire growth.

If she's not the right one...it is better to find out now. The more time and effort you put in, the harder the loss gets.

I'm sorry you're suffering, and I really hope that things work out.