I'm not subbed to this thread and stumbled onto it on c/all. I remember threads like these on R*ddit and the responses seem similar: "just leave". I don't see how that's helping. I understand your pain. And what he did is incredibly severe. I really hope he sees his mistake. If he does and apologises I think you can offer him help. Take him to seek professional attention and by the sounds of it a new job. It might help to share with him the severity and the repercussions if things don't improve. Don't get me wrong, he crossed a line. But if you're willing to fight for him and your relationship I believe these steps might help. Be careful and tighten your boundaries.
Some devices might differ and I am not sure about Samsung (and possibly their knox) but what you'd do:
Rooting does not stop official OTA last time I checked. Installing a new update will unroot your device. I doubt the device of OP still gets updates anyway but I have no clue how old the Samsung Tab devices are.
Neo Launcher is based on Lawnchair and has some extra features I believe. Check the telegram group for newer releases
@MightyCuriosity
@sh.itjust.works