My GF is pwBPD, been with her 7+ years. Recently had an acid trip with her where we microdosed (took a low dose). At one moment, the acid seemed to lift her need for attention, and I saw a small glimpse under the veil. 

She seemed more independent of me. Less tethered to my attention. More self guided. Her eyes more neutral. Her fears less sensitive, in the way she moved, talked and looked at me. In that moment I didnt find her attractive. Rather this change which i had thought was desirable I was surprised that I felt a bit insecure, wanting our dynamic back. Her gaining a sense of self independent of me, meant I felt i didnt know her for a moment and that made me uncomfortable. 

I feel BPD gives her the characteristics that I love about her, and it amplifies her in my concious mind. 

Without her borderline I would not have loved her. Would not be attracted to her or know who she would have been. Not my exciting crazy GF thats for sure.