This is a great poem Mandeline. You don't have to force things to rhyme to construct excellent poems. I think it should be more about the emotions and experiences that you are conveying to your reader. You demonstrate this so well. I didn't feel like it sounds like a break-up poem. I felt its more about a message of a broken friendship that you are really hurt by.
Personally, too many poets try to force things to rhyme, when they write, which leaves the readers with a very stilted verse to read. Mandeline, as you have proven, you don't need to rhyme, to have an expressive poem.
In many ways, a broken friendship is a break-up between two people, who once where were close. The pain, is the same just we give it a different title. Hoping in writing this verse, you are finding a constructive outlet for your pain and anger.
I think you do see that you are not rhyming, the repeated use of the word was a really good way of emphasing that. It felt a little angry and hurt, and now that i know its about a broken friendship it shows in your righting. The pain you feel at the loss of a friend is a big one, and one that only heals with time and understanding.
I'm still just a dabbler in writing. I hope that changes. For now, I have a "day-job" in marketing, waiting for the day writing becomes something that sustains more then just my outlet for my strange .. more..