I was engaged in a tense relationship with my supervisor for more than a year.

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I was engaged in a tense relationship with my supervisor for more than a year. The tension escalated in the last few months and culminated in him framing me for things I did not do. I was not given the opportunity to clarify (the allegations were not made known to me overtly). I have since left the organization but am now having thoughts about clarification now. I was fearful about clarification then as I thought it could implicate many people (including my supervisor), expend resources and worsen my lot without positive outcomes. These concerns remain. Even if I was to mediate (i.e. a conflict resolution approach), I could see no way in being honest and stand for myself while defusing the conflict and mustering a good ending for everyone. What is the right thing to do? Thanks.