The speaker is stuck in a relationship where he gets blamed for everything. The poem opens with him catching his partner in a lie and with another man, yet somehow the fault is still his. From there the accusations pile up, growing more absurd: her bad day, her mother's firing, a lost softball game, even a March blizzard, a flood, a power cut, rising gas prices and a bad waiter. The repeated line "It's all my fault" works like a tired chant, and the list makes the blame look ridiculous.
Near the end the tone turns inward. The speaker looks in the mirror and seems to wonder whether he really is to blame for the breakup. The last lines suggest the other person said it only "to rid yourself of guilt," and that she too will eventually face a mirror. The mood is weary, bitter and quietly sad, with a hint of dry humor, and a faint hope that the truth will come out.