so no idea where we stand in that regard
A solicitor should be able to help you here.
Maybe before Tuesday have a think about what outcome you want? Does your husband have a set of keys to your house? When my DH moved out (not at all the same as no cheating involved) one thing that helped me to feel better was knowing that he did not have a set of keys to the property where I am living and we own jointly. It's a small thing but you might want to think about this too.
I agree with others not to engage with your friend for now.
Your friend's husband is likely feeling his own set of overwhelmed. He might want to put all of the blame on "your" side (you and your H) at the moment, sort of to protect himself mentally if you see what I mean. If you find it distressing to engage with him, then maybe do not do that either? The two of you might get caught up speculating and that might be distressing.
I agree with pp, try your best not to let the children - any of them - become pawns in this. Not that I think that you would do that, but the situation does sound complicated, and it would be sad if your children lost their close friends on the grounds of dickish behaviour between the parents if you see what I mean?
I hope that that does not come across as judegmental as I fear it might sound. Sending
and
to you. It sounds as if you are doing what you need to do for now. Are you able to find a little bit of space for yourself this bank holiday weekend? Do you have any plans?