Everything I do seems to piss her off why?

Anonymous
My girlfriends been acting weird these days, we have been together for about 3 years and have had no problems but for some reason now everything I do seems to piss her off I come home late a few times a week since it takes awhile to finish stuff up at my work but funny thing about it is she doesn't come home most nights till very late. then she gets mad that I don't spend time with her which I don't get since she understood I was going for my MA so school work has been piling up so she leaves and goes somewhere and ignores my calls, and now she got mad at me when I slept in today and want as far as calling me a low life asshole which I don't get I haven't done anything so I told her I'm going to leave for the night to cool off now I'm staying at a friends house annoyed and tired. Girls do you understand why she's randomly acting like a psycho love her but she's acting like a psycho.
Everything I do seems to piss her off why?
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