The speaker is talking to someone who wants to get rid of them, and the message is simple: it won't work. The poem never says who this other person is or what happened between them, so the reader fills in the gaps. It could be an ex, a bully, or anyone who has tried to push the speaker out of their life.
What stands out is the calm. The speaker doesn't plead or shout. Lines like "I don't care" and "It doesn't matter / What you do" sound relaxed and certain, almost as if the speaker has already stopped worrying. The short, blunt line "And fail" lands like a door closing. The phrase "every trick / In the book" suggests the other person has been scheming, yet even their own inventions get waved away.
The mood is defiant but steady. It reads as quiet confidence rather than anger, a person who knows their worth and refuses to be shaken.