Hi Rouky, who knows what was said to SIL and who's bothered what she thinks should happen? It's what you think should happen that matters.
You don't sound ready to throw in the towel (if I may say.) Like many of us, you are still flipping about - which is fine - but I think we need to get to a very sure and settled place within ourselves where we fundamentally know moving on is the right thing.
As for how to behave with your H - just follow the DB guidelines I say. Be like a woman who has a life, has plans and is generally happy in her life without him. Upbeat, breezy, limited convo, validates, moves off on to something else as she's busy etc....
Xx
T 13 M 7 Me 48 H 46 SS 15 BD 7.14 PA D final 5.16 (H filed)
We receive & we lose, and must try to achieve gratitude & embrace with whole hearts whatever of life that remains after the losses - Dubus