So S and hubby are back together? How did this happen? How come your boy heard them? Has he confronted them or just you?
Does your boy know S is your gf? How did he approach the issue? Was it like 'Mum, Dad's cheating on you' or 'What the heck is going on here, Mum?'.
I'm sorry I have no pearls of wisdom to offer
, our kids are of the age where we need to have the sex talk before the poly talk and even that is a few years away. Check out the Children and Polyamory thread in General Discussion if you haven't already. Hugs!