My apologies but in my opinion, it's not much of a spoiler to quote the last line of the film: "there's nothing to forgive." Although I haven't yet formulated an interpretation I am satisfied with, I find that very meaningful. Perhaps that's the point. Earlier in the film there's an extended scene where I thought the protagonist was attempting to make eye contact with the audience, with me, and whether that was my imagination or if indeed it was intentional, I felt a shameful surge in that moment: complicity.
Mark Twain said, "forgiveness is the fragrance the violet sheds on the heel that crushes it." Perhaps this film is is like that act itself, both the crushing heel and the scent that survives. Either way, history's tread-marks remain. The protagonist says at one point, "I don't want to survive, I want to live." Better yet, thrive. That is what we all want and this is what we all deserve. So let us all tread softly.