Jesus wept OP. You are still talking about him changing! He won't!
What on earth has to happen for you to get your head out of the sand and actually do the right thing for your kids, your husband and yourself?
You are going round and round in circles, lying to yourself, because you won't face that your marriage is dead. You had an affair with another man FFS! That's how dead it is.
All this blah about sorting out finances - if you are serious, make a solicitors appointment and get some knowledge about what you would be entitled to. Go on the "entitled to" website and find out how much you would get in benefits. Go on the CMS website and find out how much child maintenance you would get.
To be totally honest, I think you are more like your husband than you know. You don't want to address things. You want to bury your head in the sand and take pointless steps that won't get you anywhere, instead of sorting your shit out.
You have tried to talk to him for 10 years - he hasn't listened or changed. You told him you had feelings for someone else - he didn't change.
You told him how you felt the other day - he got aggressive.
So what do you say you are going to do? Leave it a few days and try to talk to him again. Why? What on Earth makes you think he will remotely take it on board?
You have been unhappy for over 10 years. Your affair was clearly a symptom not a cause of the problem.
The only reason you are trying to blame yourself for all this is so you can pretend you have the power to change your marriage by your own actions. Wise up. You can't.
You have been moaning about him, justifiably, for 10 years. Really and truly, you are setting your kids a shockingly bad example of a marriage and an even worse example of how to address difficulties.
I have never ever read such a self defeating and self pitying thread by someone who clearly doesn't want anything to change. Because if you did you would change it. Instead, you shag about behind your husband's back, THEN want to childishly tell him to unload the guilt which would be cruel, and THEN brush it all under the carpet for longer as you are too cowardly to deal with it head on. Is that who you want to be? Really?
Yes, leaving is scary. But not as scary as living in a way that should, if you have a conscience, start to make you hate yourself for not using your betrayal of your husband to at least end the marriage and set him free.
You are behaving in a contemptible manner now OP. Really.