I wouldn't call it an anger issue, more of a "he/she made me miserable, and so he/she should be miserable for life" thing. Or maybe that's just me. I've been there before (though I can't say that I currently hate any of my exs, though there have been time where I did), and I couldn't stand the thought of them with anyone else, even when I had no desire to be back together with them again. Just the thought of them being happy when I wasn't (or even when I was) just annoyed me to no end.

Granted, this post probably is of no help getting over it, but at least you know you aren't alone in those types of feeling

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To those that understand, I extend my hand. To the doubtful I demand, take me as I am!