Lily, you have a lot of strength remaining in this situation.
I have a couple things to ask;
The first is, do you have a job? My suggestion is to go out and get a PT one around Christmas everyone is hiring even temporary. Ten-fifteen hours a week will give you some monetary freedom and the message to H is that you will begin standing on your own. If there is some reason you can't work, my apologies (I am old and don't remember everything lol)
The second is that I would not bring up OW at all, ever and start getting a crazy good life Lily. What's your GAL lately?
I should talk, I been consumed by work and school but I have a party next week and a book launch, so I am going to both
