The divorce is neither here nor there. If he somehow finds out, it's up to him how he deals with it. I'm not saying it was wrong to divorce her, although I can see the insane ironies of how Muslim men conduct themselves and practically ask for lies. I'm arguing the rationale for keeping it from him in the first place, in both logical and religious terms, heck morally too.
Habibti I am sorry to break it to you they will always find out and this thread is good example why plan B won't work. Both being promiscuous does not take away from the fact she lied to him. Period.