i met a girl diagnosed with bpd a few years ago during a night out with friends. added her on facebook and began talking daily.

she got really attached, really quickly. she told me so many things about her personal life and was really infatuated with me. it felt like she was role-playing as my girlfriend even though we had never been on a single date. 

life got in the way so i never actually got to see her, but we had entire breakup &amp; makeup arguments over a period of years. on one hand i was still hoping this would manifest in a proper relationship and was patient with her, but i found it increasingly weird how we could have all these wild fights and she could call me *'the best thing to ever happen in her life'* after meeting once, and occasionally chatting on facebook.

i did eventually see her in person, once. she spent a lot of time saying sorry for what happened in our relationship, and promised to treat me better in the future. i thought it was sweet of her but was also a bit confused, as this was technically our first date and i hadnt seen her since we first met.

it was like this girl made up an entire relationship with me inside her head and then acted it out whenever wed talk.

this girl later became enraged when i mentioned to our social group that we were in a relationship, and she stopped talking to me. i later looked up her instagram and saw she identifies as gay but that couldnt be further from the truth as i slept with her.

i cant find anything on the internet with this scenario so saying im confused is an understatement. 

i believe i was this girl's fp but i dont understand how that could happen after two dates. i dont understand why she is mad at me for saying we were in a relationship because we definitely went through the motions of one. but knowing we never actually saw each other, it sounds more like this girl was kind of stalking me and i just didnt realise it?

can anyone provide insight? im totally lost.