I have been wondering how you are. You seem to be doing just fine and I am pleased about that. As for WH, meh, leave him to it is all I can say.
Whether you call it separated or early stages of divorce it's the same as your separation is not moving towards reconciliation. The fact you describe it as early stages of divorce is perhaps good. It shows you have moved on. He will rewrite history forever. So what, your MIL and those that know and love you know the truth. People are not stupid.
I have moved on also. I have come to terms with the fact that my M has ended. I have even been out for drinks/meal with someone I met who knows the sitch. Seems really nice but nothing serious. You will do this in time also. Be careful for full on limerance however. When you have been deprived of LL's, acts of kindness etc for such a long time you really do lap it up and that could be dangerous.
The following month or so will no doubt bring you, your S and family such joy. I am looking forward to hearing about that. Keep being super mum/super you! I will think of you later down the gym spa - it's my pampering a jacuzzi (no beans required - ha ha)!.
Surfer.
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