You can go no farther without making a step toward reconciliation. The step can be a mental willingness to accept God’s help in untangling the confused mess of this relationship. You were injured by this person and perhaps they by you. Following God will not leave you open to be beat up. He will recenter you in His will in that relationship and make it holy.
It will only hurt yourself to hold onto the bitterness, hurt and self righteousness.
Open your heart and hand to God’s good plan. You will lose nothing in submitting to God. Don’t waist time. Be sure to move in the steps God has laid out before you. Finding your own path will most certainly lead to more unnecessary pain. Allow God access to the deep places, to heal and restore so you can continue on stronger and more able than before.