I messed up. Damage control?
Long story short- my friend got with someone that I had feelings for years ago. And as soon as she got with him I suppressed my feelings and we'd all just been really good friends ever since. I was always deeply involved in their relationship, as a kind of mediator and helped to diffuse things and calm both down when they fell out/broke up. However, it seemed that they had broken up for the final time, and the guy told me that he liked me and always had. And things got complicated and I did something terrible... I slept with him. Since then, to my horror, he got back with her. At first we decided not to tell her but he did, without warning me. She is understandably beyond furious, and hates me . He told her absolutely everything I told him in confidence, to exacerbate things. All my friends have shunned me and my world has basically turned upside down.
My question is- What the hell do I do now? I didn't try and make him look bad by telling her all the things he told me, like he did to me- should I have? I just didn't see the point in punishing her more just to punish him. How can I make anything better? How do I cope with this and move on?
I don't need to be told how bad what I did is, I know. I am consumed with shame and guilt.
I just need some advice- desperately, please.