In my case, I was diagnosed with two personality disorders - Dependent and Schizotypal. Although quite opposite in nature, both T and I see this "diagnosis" as very fitting for my "personality as a whole."

The Schizotypal part of me makes me not want to get too close to people, makes me paranoid about others motives, and thrives on isolation. The Dependent part of me comes out with the people that have fought through the Schizo part and actually made the status of "friend" as well as my immediate family. I often say "I'm not in the business of making any new friends. I have enough thank you." And then when my friends incorporate an extra person in the picture, I get all freak out and jealous and protective and five year old ish because she's my friend and why are you always hanging around her? But then if me and that same friend are around each other i'm like "ok, ok, ok. I need some space. Seriously. I just need to be by myself. In the quiet. Love you but I need time alone." It's a viscous cycle, lol, and T was just like "...it must be so tiring dealing with the battle in your mind..." Thats just one example of how I qualify for "more than one" personality disorder. Hope it helps you see some of the grey in between.