Anna, I am also curious why you didn't tell them about the OW.
Your in laws sound like they would be on your side.
For my sitch, the ex in laws knew about OW. According to the X, they loved her. According to the ex fil, the OW was really cheerful. In short, they knew about her and they gave her approval!!! Although it seemed that the X painted an entirely diff pic of our sitch to the fil and the fil now wants us to patch back, knowing that they liked her really is a major obstacle in any future R.
You can call me Dory/ Grl.
As a wise fish once sang,"Just keep swimming!"
It's no use to go back to yesterday because I was a different person then.