OK - although I think the discussions have centered around her situation more than anything.
BINGO... Of COURSE you want to get information from her.
The key is how to do it without her recognizing it...
The answer is to let HER talk about herself and what is going on with her. Most everybody likes to talk more about what is happening in there life than in really listening to your life.
Who wants the divorce in her situation?
If her husband wants the divorce, then it could very well be that she IS seeking his advice.
This will be simple to analyze because if she really wants to stay married then we all know that the only thing she will want to talk about or have on her mind is how to get her husband back.
That is why you NEED to be the listener when you are with her. Confrontation usually doesn't work. First you need to find out the facts.
It is called LISTENING and being a friend. Let HER open up to you.
Again. IF she is NOT having an affair with your husband, then you will know because she will be talking about HER husband and how to get him back.
Let HER tell you or bring up that she is talking to your husband. Observe and soak up all the information.
I believe that your husband DOES have an interest in somebody. We need to find out what is really going on with HER marriage. If SHE is the one wanting out, then the evidence points to your husand and her having an affair. If HE is the one wanting out, then we need to find out if she is seeking out your husbands advice to help her. I have helped and talked to a lot of women that call me all the time when going through a man crisis. Sometimes at all hours of the day or night asking the Gooch "what do I do now? or should I call him? or what if he doesn't call me when I leave him alone?" and on and on and on... They get obsessed just as most do on here. I have found that women really want a man's advice when they are having problems with the man in their life.
You need to find out if that is her mindset and she is using your husband for advice. If she is, then she will also be seeking out YOU for advice and someone to talk to. You should certainly know what that is like right?
Be wise. Get the facts. This woman COULD be a good source.