I think if you are "together" with someone you shouldn't think of others, because if you choose "one" out of all the others...well... that's the dual faced idiocy I hate!
You allready fucked her in your mind, and I'm sure you grabbed her a little bit didn't you

.. If you think you did nothing wrong, nothing at all then you have no problem to look at your fiance and smile and say "I love you", right?
The truth is, you allready lusted another one, and next time you're on top of your fiance you think about the other woman, maby you can't even get it up with your fiance too good for awhile and she wonders why.
Want my advice?
What's a house or money to hold you from divorcing her and enjoying lifes better fruits? Nothing! It's your stupid dual faced morals that you should throw away right now, dump your bitch, and get on with it, but stop your godless whining.