You are so not to blame for your MIL's illness. And she probably can't be firm with him because she fears the consequences for that....and it's such an ingrained pattern with her.
I'm really happy you joined a support group....you first need to be in a position of strength...and that will help.
You are a good person,and you shouldn't stop your kindnesses...they are part of the wonderful person you are. You MIGHT want to pull back on the hugs for H....depending on how warm he was when you did hug him.....how did that go?
Putting the funny bones in a box...is a GOOD sign, showing he has some sort of warmth towards you and you can build on that.
Your H might be a kind of addict....I wonder what Laurie's take on your situation is? Laurie is the best, and her advice should always be followed.
Ask Laurie about the filing thing as well. You do need to protect yourself so you can be in a position of strength. That doesn't mean you stop being your sweet self.
The only other thing I would ask (because I can't remember from way back)....is what is so attractive about this other woman?
Hang in there, take really good care of yourself.
sg Love is PATIENT, love is KIND, LOVE never fails / DB since 2001