This is a wonderful idea
You will never regret this decision in future
Your children will undoubtedly be fine for you to leave once they are in university
They will not blame you at all & be sure to cut ties with their father once you leave
/s
You will martyr yourself & live to regret this.
It sounds like you’re staying due to financial reasons & lifestyle comforts.
You really believe this will all work out & fall into place once you leave exactly as you envisage?
You do you but keep in mind that you will not be able to control your children’s reactions When they are adults & they may well take this harder.
You are doing this for you - not them. Something is keeping you staying that isn’t to their benefits. I don’t believe this is all about the children
Also as you say you will be shooting your self in the foot financially leaving later as there will be no reason to argue that you need more to finance the childcare aspect.
I truly believe you will regret this & waste decades feeling miserable.
Also he could well leave you & you seem strangely confident that this could never happen.
But we don’t know you & you sound really confident this is the best decision for you