The poem is built around a single word: "yours." The speaker points out that it has five letters, and that those five letters hold a great deal of meaning. It's a small word, but it carries the whole idea of belonging to someone. The speaker says nothing could part them from the person they love, which sounds like a promise of complete devotion.
Then comes the last line, "i was yours," and the tense changes everything. What seemed like a vow in the present now sits in the past. The poem suggests the closeness has ended, or that the speaker is looking back on a loyalty that once felt unbreakable. The mood is quiet and wistful, with a touch of sadness. The short lines and plain wording make the feeling seem restrained, as if the speaker is holding back more than they say. The lowercase style adds to that soft, private tone. In just a few lines, the poem moves from certainty to loss.