Fiancee disagreeing with me often lately........

[glass half full]

to the OP;
sounds like she's crossing the bridge into wanna-be-single again. This usually comes from life outside the home. There are a few ways to play this if you care about her. But you should be prepared to cut loose, and allow yourself to feel good about it, respect yourself. Remember your own self pride.

 

[seasonedplayer]

Try making a joke back like 'whatever you say sweetie'. If it continues get rid of her. She is clearly losing respect for you. How does she talk to her father? Is your financial situation deteriorating?