A speaker keeps pursuing someone who has shown no interest, and the poem is about the stories we tell ourselves to justify it. The opening image, a dog chasing its tail, is funny and a little sad: all that energy, going nowhere, with the speaker as both the chaser and the thing being chased. Each time the other person pulls away, the speaker spins it into something hopeful. Distance becomes "a challenge," and coldness becomes "refreshment," as if being shut out were a kind of invitation.
The mood shifts in the last three lines. Once the "fog clears," the speaker stands there "holding my heart in trembling hands," and the vulnerability feels real. Then comes the sting: the speaker blames the other person for not being clear enough. The tone turns wry and self-aware. The poem seems to know that this blame is unfair, since the confusion was partly the speaker's own doing. The title, "Blind Spot," fits that idea neatly.