I recently broke up with my girlfriend of 2 years and I am almost positive she has a histrionic personality (based on all the descriptions I have read). It was a very tumultuous relationship - she broke up with me a number of times and as things started getting crazy I tried to break up with her and remain NC at least 3 times.
She was very charming, outgoing, attention seeking. She would flirt with other men (although I am positive she never cheated in any physical way), but extremely jealous of my interactions with women (and I am very conservative and careful to be appropriate in my boundaries with female friends). This seemed like a huge double standard and drove me nuts!
She needed constant affection and attention. She would call frequently late at night (2am or 3am) during the week just to get reassurance of my love for her. Often, she would plead and beg me to come over to her place (30 min drive) to hold her and comfort her. I would try to put up good boundaries and tell her not to call so late unless it was an emergency and reminded her that I needed to sleep, had to be rested for work etc. This resulted in huge temper tantrums, hysterical crying, accusations of me not loving her, intense anger, etc. I would politely listen for awhile, assure her of my love and then insist that I had to hang up the phone and go back to bed to be ready for work. After I hung up the phone, I would usually put in on silent and then get a ton of missed calls during the rest of the night with a few messages with her crying and pleading for me to talk with her or screaming at me. Sometimes, I was firm, but other times it just seemed easier (crazy as that sounds) to just drive over and comfort her - even though I would be exhausted for work the next day.
A shared value for both of us was to remain chaste prior to marriage. In spite of this, she constantly tried to seduce me and did not respect my boundaries.
I felt like I was often walking on eggshells (landmines) - had to almost completely withdraw from my female friends, be very careful that I gave her almost undivided attention in social settings, etc.
After our breakup, she quickly (less than a week) moved onto a new relationship (male friend who she had become very close with during our on/off again period).