You're thinking again, but it seems like a good thing, although not too different from what you've been doing recently (trying to figure out what makes her tick).
The bottom line to DB is very simple (ok, this is like my 1000th DB bottom line, but THIS one fits your sitch, lol); You were what made her tick in the beginning and you got lost along the way. Figuring out what makes her tick should have a whole lot to do with figuring out what used to make YOU tick. Sure, people change, but again, DB seems to be founded on the principal that there was love and passion in the beginning and somewhere it got lost in the shuffle.
I hope you made your move and let's hear what happened. No matter what, you had to have learned something that mere thinking probably would not have taught you.