Winnie's poem is about a love that ended almost as soon as it started. The speaker is still stunned: "how can you just be gone?" Only yesterday they were "over the moon," and the poem keeps returning to that soft, sparkling, summer-dream feeling that has now vanished. Even the stars they saved have been hidden somewhere they can't find them, which makes the loss feel like something they did to themselves as well as something done to them.
The tone is gentle and childlike, with a nightlight, ice cream and daydreams, but under it sits real hurt. The speaker asks not to be forgotten, then pulls away, saying "you've lost me" and telling the other person to dim the nightlight. The last lines carry the most weight. The speaker has always been a daydreamer, drifting unnoticed, and this person was the first to truly see them. That is what makes the loss sting: the speaker misses the feeling of being noticed as much as the person.