At first I thought I was reading a poem, and I had to really concentrate to figure out what was happening.  I'm still not sure if I understand what was going on in the beginning two-thirds of this prologue.  Was she describing the start of their relationship, which is what I believe it is describing, or his relationship with someone else?  When they first got together were they hurting others somehow?  The last part of this became more story-like than poetic.  It sounds like he has found someone else. 

The way you write is poetical, lyrical and has a distinct artistic flavor too it, that makes it an interesting as well as challenging read.  It is difficult to understand what is happening, but I'm not sure whether that is a bad thing or not.  I think that this style might possibly turn off some readers because it is ambiguous.  I was confused by what was happening.  However, readers who enjoy a subtly worded mystery (and not as in crime but what is actually happening between the characters) might really enjoy the challenge.  Follow your muse.  I would also suggest getting a beta, although I didn't detect any glaring errors.  I think it would be helpful to have someone to bounce ideas off of and discuss how to make the piece more accessible to your audience.

You are obviously a talented writer and I feel this piece has the potential for great depth.

Holy crap Kai...that was heart wrenching and painful and so well written that I wanted to cry and scream after every agonizing line. It begs the question, how can you forgive and forget that? I wanted to comfort her and give her the strength to tell him how much she hurt and I wanted to slap him for even having the nerve to think that she wouldn't be broken by this. It needs to be continued plz.

This is beautifully written and I really hope you continue this.  Though a few of the sentences are a bit more spaced out than I feel they be, I love how you wrote this not with indepth details but more of suggestive details, if that makes any sense lol.  I seriously hope to read more from you in the future.

This was tugging at my heart the whole time, the emotions were so raw and powerful, excellent job with your descriptions. It makes me wonder what the heck he did though, there are no clues what-so-ever other than we know he screwed up royally somehow. Very well done!! I'll be looking forward to more of your work in the future.

Wow, you are a seriously talented writer! The language you used here was simply wonderful, so poetic and beautiful. I haven't read something this well written in a very long time. It is a very sad subject, and you portrayed all the feelings in it so very well. I really hope to read more of your work very soon. What a gem! How did this one get past me?!?