Anneintherain, you make very good points about selfishness. Also wanted to say I love your signature.
Purpurea, I think also that maybe there's a part of you that wants to lash out at her because you were hurt in all this. Though it might seem like telling her is just being helpful, it would be hurtful and perhaps a form of lashing out.
But I think you are on the right track when you state that you feel better "not to waste any more energy on this story." Your energies are better off directed elsewhere, I think.