How would you counsel your FDW if she tells you that her husband is seeing another woman?

I super agree with providing a listening ear to your helper because really, the most comforting act for someone who is working away from home and doesn't have anyone to talk to about personal matters such as that is to have someone to listen to their story. She might think of things to save the marriage. She might think of asking herself if it's really worth it because she is away and there's not much she can do. You can ask her to ponder if her husband is capable of being faithful and loyal to her, even if she's away. Especially when she's away. What you can also tell her is to focus on her children instead.