Congrats bro, this confidence and your positive attitude will help you immensely if you decide to meet more women. You may notice some shifts in the way that women in general are reacting to you.

Congrats man! And well spoken on the topic of not taking it personally should a girl turn you down. Definitely one of the best things you could ever learn from the community. It really changes your outlook on this kind of stuff and you generally feel happier in yourself with every interaction regardless of outcome.

Now, about your lay. Yeah, it happens. Some people just connect like that(You'd honestly be surprised at how many people "connect" with you). When that happens I believe you just feel it. You get that feeling in your gut that says you should like her and it's generally because she likes you too. I do remember reading something -- maybe even on these forums with links to scientific studies -- about how our bodies actually pick up on this stuff and things like "butterflies" are the bodies way of saying you're into her and she's into you. If this is the case all it takes is initiation and not much gaming because you've already connected regardless of how much or how little or how bad or good the interactions between you were.

One thing you should take from PUA is that it's meant for meeting women and generating attraction then impressing them and convincing them you're of quality enough to sleep with. It's not exactly for existing relationships although to a lesser degree it does address those and it's either hit or miss(Lets be honest not everything works for women at this point).