First of all how do you even know for sure that it is bipolar?
Everyone has different realities and perceptions.
The anger well did you let this person down in any way?
See anger comes from being let down. I know. When someone wrongs me I get very angry. I can rip them to threads if need be.
So there is no answer to this question that would constitute a useful suggestion.
If you don’t know what to call it?
Because there is nothing to call perhaps you may need to talk with someone yourself about this troubling situation.
I can tell you therapy and a support system with friend helps a bunch.
But yeah…..if you feel this strongly and don’t know what to call it I advise you to get Therapy as well. Good luck God bless