Does your fiance even know about this or does he just think you have a GF you hang around with. Or did this current GF just figure out what place she found herself in with you & maybe that's why she's not talking to you????

The thing is that the treatment you give others comes back to get you in the end & if you aren't open & respectful to them....they aren't going to return good treatment to you....sounds like you are playing with fire & complaining about getting burnt.