I agree with everyone else that there was nothing wrong with a little female interaction. The question is are you seeing it more like a friendship or are you getting "intoxicated" because it's another drug to substitute your W? You've shown in the past that you've substituted one form of addiction for another. I can see this as being the same. That's why you're falling so deeply for this person.
For God's sake it was only one night. If you felt totally intoxicated with this person, then you've got a bigger issue. It's not a grown up R. For all you know, she felt lonely too and latched onto you because of that.
This. Also, if you think you can get to know a stranger in any way that even approaches deeply and authentically in one evening in a bar, you are in no way ready for ANY relationship.
Instant spark? A little opposite-sex validation. Sure, absolutely. But that's ALL it is. A healthy relationship is not based on mutual ego stroking.
Serious question: What was so awesome about her *beyond the fact* that she was reasonably attractive and kept blowing off other guys to stay focused on you?
Also, watch your vocabulary. I see repeated phrases like, "I was captivated by her, I shouldn't allow her to draw me in", etc. That betrays an attitude of powerlesseness relative to this woman that is neither mature nor attractive. I highly doubt you were just sitting there like a bump on a log, not responding, and it was all her. The same would be true of any repeat interactions. Own your own stuff.
"Show me a completely smooth operation and I'll show you someone who's covering mistakes. Real boats rock." -- Frank Herbert