There is a lot of emotion in this piece. The grief you felt when writing it is quite evident. It reminds me of failed relationships in the past and how difficult it is to let them go. Darn memories!
The emotions are strong, but the grammar is weak. This is what I consider a "stream of consciousness" piece of writing. It is therapeutic to write, but a bit hard to read. Improved punctuation, and separating the different supporting text into paragraphs will make it easier to read.
It would have been nice to also have an introduction of the break up. Perhaps it was a snip of conversation, or the last time you saw the person. Describe that moment, take us there, and then the emotions you express so well will mean more to the reader.