Jesus says turn the other cheek, which means to let yourself be made vulnerable to further harm for their well being.  It isn't about right and wrong.  Justice is important but the prayer of the publican is "Lord have mercy." Jesus says the Father will have mercy to the extent you do.\n\nThis does not mean you need to go back into the relationship as boyfriend/girlfriend but you are called to forgive in your heart and to tell them they are forgiven.  If you are carrying this around the anger will turn into hate.  Anger is rejection of what was done, hate is rejecting the person as a person.