You have to consciously decide to let go of the bad. She cheated on you, therefore no longer cared about or respected you. She lied to you. Therefore her emotions and security were more important to her than yours were.
You have to ask yourself, is someone who loves their self above all else and doesn’t care about the pain they cause me worth my lobe and unending commitment?
You don’t need to hate her, by any means. But she doesn’t deserve the pedestal you put her on. The girl you fell in love with doesn’t exist any longer, and no longer will. But that doesn’t mean someone similar and better isn’t out there.
Move on, and try your hardest to consciously forget about her.