and this desire to fix her won’t go away
That statement that you made was revealing. You are a member of a personality group that I am also a member of -- the Fixers. Fixers are compassionate, caring people, often highly intelligent, who have a strong inclination to not just lend support, but actually help others "fix" their problems.
People in this personality group often migrate to the caring/helping professions: medicine, psychology, clergy, etc. They get some heavy psychological reinforcement from reaching out to others who are depressed, or needy, or in some way in need of aid or succor. The reinforcement they get comes when that person accepts their offer of help and their kind advances, and clings to them. We of this personality group feel useful, special, when this happens. We feel protective of the person. If the person is of the right sex, and we find them attractive, we often have romantic feelings for the person.
I've been in this role on more than one occasion. It sounds like you might be in this role in this particular situation. Have you daydreamed about or envisioned a future moment when this woman will cry out for you, apologetic for hurting you and now realizing you were the right one all along?