Meeting someone for the first time, the speaker feels strangely as if they already know them. The reason comes in the last lines: the other person's brokenness looks just like the speaker's own, the one they see in the mirror every day. The recognition isn't based on shared history or long acquaintance. It comes from seeing a familiar pain in someone new.
The speaker's feeling seems to be a mix of closeness and quiet sadness. There is comfort in being understood without explanation, but also a hint of weariness in "everyday," which suggests this self-image is not a passing mood. The mirror is a clever choice. It makes the other person a kind of reflection, so connecting with them is also a way of facing oneself. The mood is intimate and hushed, tender but a little heavy. The poem is short, and its plain wording makes the admission feel honest rather than dramatic.