This is tough, alot of good posts here.
So you've been with your current gf for 11 years and you're not married why?
I'm not saying thats how things go, but when a couple has been together that long, typically theyre married
Anyway, are you sure you guys click? Or is there just mutual attraction/curiosity outside of yours and her's relationships?
Everyone seems great in the beginning, its not until after a few months into a relationship they start to show their true colors.
When you started feeling differently about your current relationship, did you stop and think about how to fix things? Or did you automatically think "oh well, time to move on"?
From what it seems like you started feeling differently, and you didnt really give it much thought so you started being a jerk to her hoping she'll do something about it, making it easier on you.
You already admit that she's a great girl, so before you decide to jump ship you should sit and REALLY think about what you're doing instead of letting this new girl cloud your judgement. You dont come across great girls everyday, especially not in Vancouver