Irrespective of how much someone has hurt you in the past you ought to help them for humanity's sake because humanity differs from mere justice in that there is a level of altruism towards individuals included in humanity more so than the fairness found in justice. Humanity, acts of love, altruism, and social intelligence are typically individual strengths one carries in their hearts. This also shows you are strong enough as a person to let go of the past, a conciliatory attitude is much easier for everyone to deal with than a hostile and defensive one. One should maintain an attitude of love and acceptance no matter the situation, this doesn’t mean you agree with the person who hurt you or whatever they did to you. Rather, you have chosen to respond in a certain, mature and predetermined way. However you have a right to define what your limits are and insist they should be respected. Good luck in finding your inner peace, happiness and satisfaction.
NB: Relationships may fade away but humanity doesn't
