The speaker is confessing a love they seem unable to hide, or perhaps unable to say out loud. The opening line, "little do you know," suggests the person they're addressing doesn't realize how completely they are loved. Yet the speaker also admits that this person has hurt and lied to them again and again. Love hasn't faded because of that, and the speaker says they are "100% entirely yours," almost as if stating a fact they can't argue with.
What gives the poem its ache is the line "that's what's most painful." The pain isn't only about being hurt; it's about knowing it and staying anyway. The final line, "i just keep coming back," has no punctuation and simply trails off, which makes it sound tired and resigned. The short, plain lines and lowercase style feel like a private, quiet admission. The mood is sad and vulnerable, with a hint of helplessness, as the speaker seems caught in a cycle they understand but can't break.