The speaker is in darkness, and the poem makes us feel it. They are blind, or at least cut off from sight, and they reach out hoping to find something familiar. All they get is "textures and temperatures," nothing that feels like a person. The loss is both physical and emotional, because the one they long for is gone, and the dark leaves them alone with that fact.
What keeps the speaker going is memory. The loved one's face appears like "flash frames of light," and their voice is "bittersweet." But the memories bring pain too. The speaker calls out and nobody answers. That is why the repeated line calls the memories "a blessing yet curse": they offer comfort and hurt in the same moment. The last lines hint that love itself is what "blinded" the speaker, which suggests the loss is as much about heartbreak as eyesight. The mood is quiet, aching and deeply lonely.