I feel you are getting a rough ride here just because you are Male.
If a woman had posted this it would have been LTB all the way.
Anyway, in all honesty you know deep down that your wife has checked out of this relationship- and some time ago too.
It’s such a shame that she put no effort into marriage counselling- this should tell you all you need to know really. She didn’t put the effort in because she didn’t want to save your relationship.
I think that her behaviour when you were ill was beyond the pale - leaving you alone to go for every treatment session! Shocking. Once again, imagine if a woman had cancer and her husband had been to one appointment then left her to go to every therapy session on her own. LTB all over again.
Sweetheart - she really really does not care about you. I wouldn’t let my friends husband who I cant bear go to radiotherapy appointments on his own - never mind my own husband. In all honesty I think that in itself is grounds for a divorce on her unreasonable behaviour.
Go and see a lawyer and make a plan.
Get the house valued and on the market.
She can’t be cold and indifferent with you but expect you to provide for her while making you incredibly unhappy simply so she can keep,the house and toy farm. Because that’s what it is isn’t it - it’s not somethimg that makes you self sufficient or brings good money in . It’s a lifestyle choice and a luxury you can no longer afford.
Ypu need to sit her down and tell her that it’s over and you are going to get divorced and you need to make plans ie when and what are you going to tell the kids,.
It’s time for you to stop treading water and start swimming for shore. Take control of your life - you are just drifting like a rudderless ship ( thought you might like a ‘ sea’ analogy!) and you need to fix the rider and get hold of the captains wheel,again.
Only YOU can decide where you want to sail your ship called Life- where do you want to live? How much money will you have after the divorce? Will any of the children want to come and live with You? Would you want them too? Where do you plan to work?
There’s lots for you to sort out and you need to start doing it instead of clogging this dead horse that your marriage is. You are just beating yourself up going over and over this dead ground.
You need to move on and let her go.
When you get up make yourself a pot of coffee and do your self a list of things you need to do in order to start the next chapter of your life.
Put target dates by each one - and get on the phone to a lawyer and an estate agent.
Take charge of your own life and destiny.
And I wish you lots of good wishes for your future. I don’t care what other posters say, we can only go on what’s written by you and I think you sound like a lovely bloke who has tried his hardest.
There’s a new life waiting for you - go and grab it with both hands.