The speaker is trying to break free from a painful past and from a person who shaped how they were seen. The opening lines describe memories that keep returning, and a sense that fate has sided with the other person, leaving the speaker with "endless cuts and scars." Still, the speaker refuses to be destroyed by these broken pieces, admitting that things came dangerously close.
The mirror is the central image. When the speaker looks into it, they see a face they barely recognize. Then comes the turn: the mirror itself was "faulty, broken even," held up by the other person. Everyone else accepted the image, but the speaker doesn't. The final lines suggest that the reflection was never the real self, only a picture someone else wanted the world to believe. The mood moves from hurt and exhaustion toward quiet, stubborn clarity, and a hard-won sense of reclaiming who they are.