Sunny, Do not send the messages to the guy's fiance. If he is doing things behind her back, she will catch on quite quickly. As for your w, she may have been doing all of this flirting to see what your reaction would be or just to get you some gas. They love to jerk our chains and enjoy watching us twist and turn in the wind. Don't give her that pleasure. The less you react to her behavior, the better. They crave attention, whether it is positive or negative...they don't care.
What I would suggest is that if you still have the messages, print them off or store them in a safe place.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
