Did YOU SPECIFICALLY inform your in laws that you wanted to save your marriage?
Did YOU SPECIFICALLY ask your in laws to support the marriage rather than their son's affair?
I am just wondering if the in laws have all their facts straight.. You do realize your Husabnd is going to spin a tale to them like "we are getting a divorce, my wife is k with me moving on, we both agreed to divorce asap" etc?
You DO realise eh's going to tell his parents stuff like that right?
You need to get the facts stragith with your in laws and keep in CONSTANT CONTACT with them... you can't just sit and hope they will know how you want tehm to handle things... your H is giong to lie to them.. if you aren't there to counter it regularly then your in laws will assume he's teling the TRUTH... He's their son they are giong to trust his say so if they don't hear different from you