There are quite a few books and studies about how women's sexual desires tend to be more fluid than men's, meaning that a woman can be totally straight but that if the right person/situation/timing presents itself in a sort of perfect storm, a woman may feel something for a particular women while still considering herself straight and not being attracted to women in general.
You can't really compare your desires to his. Sexual fluidity is common in women, but not in men. It's pretty well documented that sexuality for men is usually black and white, where it can often turn gray for women given certain circumstances.