I definitely thought bipolar II for the longest time before BPD occurred to me. She did tend to go through longer periods of highs and lows, but at the same time could change her tune overnight. She was not overly emotional- on the contrary, she seemed not emotional enough. Very superficial personality and very cold/unemotional when in an argument, yet there were definitely times when she could get emotional (often about missing her family or feeling like her parents didn't love her/she was a "loser", but a couple times got emotional about her feelings of love for me). She was pretty manipulative but I don't think it was intentional or that she was even aware of it.