Our expert says:
I don't hear anything suggesting "a mental condition" but more about someone who may have been spoiled and who is behaving badly. Why rage against your gf's ex ? He did nothing to you.
See a psychologist / counsellor for a proper assessment, and a discussion of the problems identified and an exploration of ways of solving them.
There are many possible explanations for this situation which you have the good sense to recognize as unsatisfactory and needing revision. The need is for an expert tyo help you identify the explanations, and devise a way of solving them
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