This is so beautifully written that it's hard for me to give any critique. My eyes were senselessly engaged from the first stanza to the last, and wished the story continued on.

I love how it begins in a romantic and nostalgic mood, and then darkens into something else entirely. It was a smooth transition, which sort of snuck up on me. Through a second reading I saw how it was purposely hinted to at the beginning, which I found quite clever.

I love the visual at the end: "Fragile girl. You hide under the mattress like a pea chiming in to disrupt the comfort of this adulterous couple." I can imagine this torn up girl hiding there, waiting to let loose her pain and rage on her betrayer.

There are a few spelling errors, and I only mention those so that I can say something helpful. Also, and this is just a suggestion, perhaps the word reminiscing should be used in place of romanticising.

I really enjoy reading your work, and I hope to critique more of it in the future!