You sound exhausted, quite understandably. I would normally tend toward the "stay for the sake of the kids" camp but if you can afford to, I think you should go.
There is much more to this than boredom and unhappiness.
A few years ago I could have written your post. I've been with dp for 30 years. We have one dd. We used to get along fine until she was born: similar interests, similar outlooks etc. Not a bed of roses, but what relationship is?
He's a great dad-when it suits-but otherwise the relationship is rocky, with a good deal of resentment (on my part mainly), compounded by frustration at what I see as his lack of engagement in our relationship. I've had counselling; he's in denial.
I can't afford to leave, so I've worked hard at making my life better, thus taking the pressure off trying to make a dead-in-the-water relationship work. We sleep separately (his choice) but the situation is tolerable, at least.
I completely empathise with your frustration. You do everything, including earning the bulk if the money. This must be so hard. Your H should at least be supporting you in making important decisions.
Personally, I don't see him changing. Why should he? He's getting an easy life, thanks to you.Counselling hasn't worked either. If this man can't see why you are angry and frustrated, then perhaps you shouldn't waste any more time on him. He's failing to step up, and you are the one beating yourself up.
Find a way of helping your dcs through it, and go.