Hurt puts us inside the worst moment of someone's life: a person is bleeding, dying, and the speaker can't stop it. The language is short and frantic. She begs for help, bargains ("Let me take your place"), and reminds the dying person of a shared promise not to leave. Counting "one, two, three, four" and telling herself to breathe shows her trying to hold on to control while everything slips.
Then the poem moves from the event to its aftermath. The death is confirmed, and the grief arrives as tears, screams, and pleas for forgiveness, which suggests guilt as well as sorrow. The final stanza turns bitter. The speaker rejects the cliché that time heals everything, because it didn't heal "hers." The poem doesn't say who she is, so that last line stays haunting and a little unclear. The mood is raw, desperate, and angry, with no comfort offered at the end.