It depends, of course, on the severity or duration of what was done to you. Life is too chaotic to succumb to rigid principles. Conflicts are an important and integral part of life. One should never seek them out willingly - but when confronted with a conflict, one should not avoid it. It is through conflicts and adversity inasmuch as through care and love that we grow.
Human relationships are dynamic.
We must assess our friendships, partnerships, even marriages periodically. The past is insufficient in itself to sustain a healthy, nourishing, supportive, caring and compassionate relationship. We must gain and regain our friendships on a daily basis. Human relationships are a constant test of allegiance and empathy. They feel threatened and they want to neuter the threat by smothering it with oozing pleasantries.