A breakup is told here from the side of the person who didn't want it. The speaker opens with a question, "How do you say what you feel?", and admits they can't fully understand their own emotions. They describe the other person's love as bliss, something they never wanted to end. Then the relationship hits a hard moment, and the partner decides they weren't strong enough to continue.
What stings most is the lack of choice. The speaker says the decision was made "without my say," and even though the partner calls it the worst mistake they've ever made, nothing changes. The short lines "So then it's settled. / Just like that." sound flat and final, as if the speaker is still stunned.
The mood is quiet and sad, with a note of resignation. The speaker insists it isn't the partner's fault, and finally says "okay." The last line, "Letting our love drift away," suggests the ending isn't dramatic. It's a slow, painful letting go.