Chicks definately go though stages of needing to "redefine" themselves as they mature, and if you're the guy sweeping her chimney when she shifts gears, you are history.

Merg: Your GF looks hot, and by hot I mean a high maintenance pain-in-the-ass. Fuc% a hundred more like her, find one you can deal with on a long-term basis, marry her and have kids, enter middle-age and deal with real life shi%, and if you're still with her then regail us with your phylosophy on women.

BTW: Human monogomy is a hoax. We do it, but it's not natural.