if i knew why would i ask
This comes across as dickish. Seriously, is it too much for you to, as I said, "hazard a guess?" It isn't. I spent almost a decade studying this stuff, and honestly wanted to hear what you thought so a) I could properly answer you and b) get a perspective on people who haven't invested large portions of their lives on the difference between prose, poetry, and prose poetry. If you want to have a discussion, have one, don't be all passive aggressive about it.
Anyway.
Poetry and prose are generally divided by the fact that poetry has line breaks and prose doesn't. The narrative versions of prose and poetry can both read similarly, especially when you're comparing narrative poets to prose writers, because the driving force behind the content is the narrator which means it's either a) delivered in a linear format, with a beginning, middle, and end, like my piece, or b) it's entirely voice-driven like door's.
This doesn't mean a narrative poem functions the same without its line breaks, and this is where the idea that "poetry is prose with line breaks" falls apart. In essence, the line break of a poem is a precipitate of the line's functionality--isolating a fragment of content in order to augment that content. I know that sounds obtuse, so here's an example: any of Pablo Neruda's odes are fragmented into these tiny, bite-sized lines, generally isolating nouns or flourishes of description. These smaller lines force the reader to slow down and really appreciate each line, savor it, creating a specific and measured pacing controlled by Nerdua's language. Larger lines are read faster--a musical analogy here would be something like rubato, where a piece is conducted along several tempos, making certain bars heavier and others lighter.
As a way to control these units of words--these lines--poetry is very, very economical in its selection of words, often choosing sparseness over exposition and purple prose. But it gains a lot of freedom in doing so--a steep line break could represent a pause in someone's speech, whereas prose would have to use an ellipses or an m-dash; a long line can add weight to a sudden short line; a measurement of equal syllables across a quatrain can metaphorically mimic speech; etc. It also creates an element of abstraction to pieces that prose lack, sometimes exhibited in the very sparseness of the language being employed--like how in paneled comics you see one still frame, then the next frame something's changed and you post-assemble the narrative between the frames without actually seeing it. Prose can't do this, in general.
My piece is a form called prose poetry, which is usually considered poetry, and tries to borrow the form of prose while measuring itself out like poetry, but without the lines. It's basically a wolf (poetry) in sheep's clothing (prose), as it's still measured and economical, but it eschews linebreaks for long, uninterrupted lines, creating a piece intended to be read as a whole or in large chunks. It's a format created by Baudelaire and Poe and Whitman as a reaction to reject the line, but it's expanded into a form of its own... sort of like the cronut of poetry.