The speaker sits with a question they can't quite answer: which hurts more, the scars on their wrists or the damage done to their heart? The scars suggest past self-harm, and the poem treats them as a physical record of pain. But the speaker places the emotional wound alongside them, as if the two belong together. "You caused both" ties them to the same person, and the flat, almost tired "No surprise" tells us this isn't the first time they've been hurt this way.
The last two lines carry the real sting. "I thought you'd be different this time" shows that the speaker hoped, trusted, and let someone back in anyway. The sadness comes less from the pain itself than from that disappointment. The mood is quiet and raw. Short lines and plain words make it feel like a thought spoken softly, without drama, which makes it hit harder. It reads as heartbreak mixed with weary resignation. The poem is very brief, but it leaves a lasting ache.