Fade?? Too much Star Wars or what?? Boy, you must be from
another planet...LOL.
Do you mean that you do not want to further develop this r/s that
you have?? If this is so, you will really need to ask yourself for
the reason. But to simply end it bcos of an assumption that your
interest for her will WANE with time is simply LAME. Now that the
both of you had known each other for sometime it is only natural
for the r/s to go onto another stage. As all of us are imperfect,
we just have to live and carry this to the end and whilst we are
still breathing then let us try and do what's not only best for us
but for those around us as well. 
