Hi, OP, glad to see you are managing.
He doesn't have to be a monster to treat you appallingly, and being lost and scared does not preclude him manipulating you intentionally. It may be his only modus operandi right now. In fact, the more lost and scared he becomes, the more he may start to lean on and fall back into old, nasty habits. And he HAS treated you terribly.
I'm glad your days are manageable, because daytime is when you work, meet friends, get things done! I would suggest that you allow yourself to feel as awful as you need to in the nighttime (preferably without too much alcoholic self-medication) so that all the awful things you remember having to put up with begin to sink in, to a subconscious level, so that you won't have to reach very far next time for ways to protect yourself.
I have a feeling that one of two things may happen in the next few weeks:
He will become "comfortable " with his new arrangement and "decide" that now that things are calmer for you, you will consider other options such as dating again ( he will tell you he's done a lot of thinking and working on himself). He may even offer (shock) apologies for some things he has said or done.
or
He will meet someone else and you will rarely ever hear from him again.
Living on his own in a small flat with three children and no time for his gaming is not what he wanted, so it is likely that he will broach these subjects again.
I think once you have a few weeks to yourself, however, you will be able to see through any manipulation techniques fairly easily! In your posts, I see how you are starting to really understand what your relationship has been like. You may reach genuine acceptance pretty quickly, but don't push yourself too fast. Feeling the pain is the only way to get through it in a way that makes it likely that you won't find yourself in this position again.
I hope your week goes well.