Famanon have a website for family members of addicts, they run meetings as well if you want to have a look to see if there’s any near you. I think they have some on Zoom too.
I know what you mean about friends maybe not understanding, but just think it’s good to build up a network of people who will support you through this. It’s tough feeling like you can’t say why you’re struggling and we need all the help we can get!
I hope you keep getting this time to yourself and don’t feel rushed into welcoming him back. You need this time just as much as he does x