Hi again guys.
Thanks for your insightful replies.
Well for me high-functioning means going without an episode as such.
I will start off going bad with a depression. I feel so bad, like i am physically aching from it. This can last for a good few months, during this time i'll have lot of rage fits, i'll devalue and discard my boyfriend constantly, i will drink and take lots of drugs, i'll try and sabotage my relationship in some way, my promiscuous side comes out and i'll think about or actually cheat on my partner as i feel he doesn't give me any attention, i get horrifically clingy and needy... yeah. When i'm bad i'm bad. My behaviour is all to fill up the chronic emptiness/loneliness i'm feeling.
When i'm good however you'd think i was perfectly normal, i'm able to aim and achieve well in these periods, i love my boyfriend and i'm the nicest girlfriend (maybe idealisation, i dunno), but i'm good. Though interestingly as some of the other posters said, if i'm good for too long, i do get bored. Sometimes we just can't win.
I also should add I only really suffer with my bpd when in a romantic relationship.
x