One key is your admiration for ex's perseverance. So from this her personaility, you unconsciously think she is tougher than you. And stronger than you. Can do things better than you. Ask self if this is indeed true. She depends on you most of her life with you. Your miserable life translates to hers. So she is not really more capable than you. It is this very thinking that makes you subdued to her and be the weaker figure in the relationship. This only translates into disaster. // Now it is time to think of her as a weaker figure and you be the strong one. And it is much easier to let go.