Some really interesting insights here to be honest but all I can do is think about how I would feel if this was my "wife" carrying on with someone else like this.
My life is lived with a simple statement - "what goes around comes around" so just bear that in mind in the future, you have a close age gap so thats a good thing but until you can answer every question with a positive and conclusive yes (for yourself) then you should be very careful.
If her husband is abusive and or violent you should also consider your own personal safety what happens if someone comes after you and her?
I am not trying to sensationalise anything but expect the unexpected.
Good luck whichever route you take but personally I would walk away.
Tone
