I have the same problem. I think the problem is that women seem to associate
the scent you wear completely with you. They want to smell the scent and remember YOU. For example, I was wearing Armani Mania when I met my fiance. I continued wearing it for a few weeks into the relationship and then stopped, mainly because I started getting really into frags and especially niche stuff. Since then I have not heard the end of it. Everything that I consider to be superior to A. Mania she doesn't really like and she keeps telling me to wear Mania again because she really loves it on me. Anyway, over time I have made her understand that I am more interested in more high quality and unusual scents and pretty much stopped wearing Mania at all. I think she is starting to get the idea now and is starting to actually like other things on me now. For example she really likes Endymion, Dzing, Marc Jacobs and Mugler Cologne.
Now I still wish she would come around to enjoying things like Vetiver based scents and Gucci Pour Homme.
I really do agree with telling people about the more intricate aspects of fragrances like Top Notes and Basenotes, dry downs and especially what goes into the making of a great frag. People appreciate it more once they know more about it. People always look at me a little weird when start telling them about my fragrance interest and I know they think that it's not a really "man's" thing to be interested in. I really don't care what they think though. I am a Renaissance Man, damn it