IMO, you're too upset and emotional to confront her today or tonight. 24 hour rule. If you have an agreement to be honest, then hold her to it, if YOU are ready to deal with the consequences of dishonesty in that conversation. Also, I haven't been following you all that long...sorry for butting with might be a pretty rotten idea in your case.
Live your life while you are still living. Riding the trail less traveled.