The speaker of "Ex-stalker" looks back at a love that seems to have existed mostly in their own head. Early on, they admit their mind is full of "untrue tales," and they struggle to separate what really happened from what they invented. Question after question follows: did the whispers, the stargazing, the loving glances ever take place? The answers seem to be no.
As the poem goes on, the speaker sees their behavior more clearly. They only watched from a distance, and they call themselves "a mere shadow" and "a joke." Their self-mockery is harsh, even when they say they should "go behind bars." The last stanza brings in torn photographs and bitterness, yet the final line shows that the longing hasn't gone away: they still want a phone call.
The mood is regretful, embarrassed and sad. The repeated rhymes make the speaker sound like they are going round and round in their thoughts, unable to escape.