The Chemistry -- how does it happen?

One thing I wonder about is the chemistry. This wasn't psychological because I felt it immediately, well before love-bombing or manipulation and in reading our early texts, it's hard to tell who was lovebombing who. I remember seeing him across the room for the first time and my stomach dropped in a good way and it felt like recognizing the other half of my soul. Not "nice to meet you" but "Oh thank God, there you are."

And aside from the intensity and passion during sex, there was just a current between us, even while snuggling and our faces were close -- it was something that felt tangible, it felt like love in a palpable way, I've never experienced it before. And although he's the biggest liar to have ever lied, he also often said he'd never had it before and sometimes even felt frustrated by it, would almost lament that it was intoxicating and felt like a drug and made it so hard to forget about me (but now he's fucking a 27 year old waitress so, I guess he managed.)

Did you have that? Does everyone experience them that way? I explained it to the other woman when we compared notes and she didn't think she felt that with him. Why did I? Was it just incredibly bad luck that I found that once in a lifetime chemistry with the worst person on the planet? Or is there something about BPD that causes it?