Emotion is a strange thing. It creates a motion of action. Like ripples, it affects the sequence of what will happen - some inappropriate, some for the better. Strangely enough, it may behave as a defense mechanism. And yet, they can be torturous.
Anguish, I think, is the perfect word of knowing that you have been betrayed or disappointed. It compiles of feeling murderous, hurt, despair, numb, and sometimes hollow. It is normally caused by broken trust, which can easily be layered under a mask of smile. But in truth, mental and emotional pain runs deeper than external scars, so even years of trying to forgive and forget can be impossible.
Sometimes, they damage you for a lifetime. Those are threads you can never mend.
I have not forgotten.