I started to forgive a friend, but then he never responded to me. Can I forgive even if I get no response from him or should I just abandon the process of forgiveness?
Because forgiving is a moral virtue, it can be practiced unconditionally, regardless of the other’s response to you. You would be offering a gentleness to that other in spite of what was done to you. If the other refuses your gift, and if the person is not trustworthy, then you need not reconcile. Yet, you still can proceed with forgiving the person for the past injustice and even for his ignoring you as you offer forgiveness.
For additional information, see Choose Love, Not Hate.