The speaker addresses a girl in three short letters, each one more raw than the last. She is "lonely," "shaken," then "soft," and the changing names suggest the speaker is remembering different sides of her, or perhaps a relationship that shifted over time. At first the tone is almost polite, with a casual "hello, how are you doing?" that barely covers the ache underneath. Then the speaker admits to wanting her, even to wanting the pain she caused.
The central image is the daggers: her words, "whittled down" until they cut. The speaker doesn't resent this. Instead they crave it, comparing the need to an addiction and punishing themselves with thoughts of self-harm and self-blame ("what I deserve"). By the end the anger drops away and only missing remains, including missing the hurt itself. The mood is obsessive, bruised, and painfully honest, a love that has become tangled up with suffering.