Ilove well of course you will get a different response if you post discrete examples of behaviour in AIBU, but the bigger picture in Relationships! Also I've noticed that this section tends to have more intelligent posts from women with years of life experience who challenge sexism and male entitlement. The point is if you're looking for validation for your decision to put up with an unhappy relationship, then you're going to respond to posters who collude with you and won't challenge your thinking. That's not particularly helpful and often means they themselves want support for their own poor choices and have a vested interest in other women not rocking the boat, because if they did, it would highlight their own inertia. I'm sure that's why you and the OP feel a sense of kinship with one another and respond so positively to eachother's posts.
Comparing this husband's housing decisions with other men who are worse is also not very helpful. Comparing him against a standard of honesty and transparency about his financial motives, is more relevant. Women often take too much comfort in thinking 'Well I agree he's awful, but at least he doesn't beat me, leave me with no money, drink, use drugs etc.' when in fact they should focus on validating their own feelings of dissatisfaction and accept that the only systematically cruel behaviour acceptable in a relationship is none.
OP I'm not challenging your view that your husband is unhappy, or that some of your behaviour isn't contributory to that unhappiness. It sounds like a thoroughly miserable life for both of you, but especially your kids who've got no choice but to live with you both.
But he is staying put not because of love, but out of financial necessity and to get his housekeeping needs met. He wasn't concerned for your children when he left for the OW and put his own happiness first, so he's not there for them either.
I don't think you post on here for validation about how awful your husband is and that you're right to feel like you do. On both threads I've been on, you've had that in bucketloads and it makes no difference. If you've had even more threads you've probably heard from 500 other people who've told you your husband is a shit.
I think you post in the hope that someone will tell you that you're making the right decisions with your life.
The posts that probably frighten you the most are the ones that query your own behaviour and urge you to stop being a victim and wallowing in it. I expect your reaction is to run and hide when you see those, get a bit angry with those posters and check-out of the thread......until the next one.