You do seem to be going through a rough spot. As a master overthinker myself, I knows it when I sees it!
You kicked H out, and now you want him to move back in, without any progress on his part. I totally understand you want to protect your kids. But you're breaking your own boundary by having him move back in. Helping S settle in school, and avoiding having "the talk" with the kids for now, isn't a really good reason to torture yourself.
The funeral thing seems like it'll really stress you out. You won't be a couple there - you'll be going with a memory of him, while the new unrecognizable him mocks that memory.
Me-47,XW-43 S13,S16 M:18 BD:4-23-17 W filed:7-17-17 (5 months of in-house separation hell) W moved out:1-6-18 D granted:2-15-18 Decree signed:3-29-18