i am sure you will find out in time. All I can advise is that you carry on with the changes you have made - after all they are to help you first and foremost and if they show your W that she should be reconsidering her course of action then that is a plus.
Don't dwell on is there another person - I just mentioned it because of her behavior. If there is someone else you will find out eventually. How neutral is the person you asked if your W could be having an A? Is there a chance they would cover for her? Is there a chance they could be involved?
Saffie me 46 H 46 M in 1986 D20,D18,S16,D13 H's A 01/05 to 07/06 H recommitted to M 07/06 renewed vows 09/06 Going from strength to strength