I like it. It's a subject that's been done a few times...but what isn't? Life has so much in it that you can take a million different views of the same thing and they can all be beautiful.
I like the use of the word sustenance. There are a few times that I've thought my pain was what got my ex through each day...and sometimes I think it is still. And yes, your hate will keep you warm on a cold night. It eventually warms, but it can also freeze. Which sucks...from one extreme to the other, ya know?
Anyhow, I think you did an excellent job. You have a depth that it's sometimes hard to see in younger writers. I look forward to more submissions.
Oh, and thanks for enjoying my work enough to stalk me...It makes me warm and fuzzy inside...ha ha.