It could be either, Jenni, I'm not sure, but the full on then totally off types of connections generally are indicative of one or the other ... Of course, it would take a professional to actually make the diagnosis.
I've lost a few good friendships along the way because of this and I didn't understand why I was like that, but now that I do, I work diligently to not present such erratic behavior, and explain to people I want to keep in my life (without going into too much detail) why I sometimes need to "hide".
Of course, it isn't lost to me what a complete befuddlement it is to those who aren't aware of it and what a revolving door/roller coaster ride it can be for them.
It might help them to get into treatment to explore it, if they'd like to ... I know the therapy I've been doing over the past 20 years has helped me tremendously.
But, then again, they may be totally unaware or not think anything is wrong with it and until they do, they'll probably be very resistant to even a suggestion that there may be something wrong.