*I think I’d struggle financially because it’s highly likely DH wouldn’t want to give me anything and would fight every step of the way and I will just back down for an easy life.
But that's not his decision.
You are basically saying you are staying out of fear that your dh, won't contribute towards your kids.
There's something there, that make should know he would use his kids to hurt you.
If he tried to get away with not paying CMS, it would come as a surprise to you.
So, you know he isn't a good man who actually really cares about his kids. You know he will put his own feelings before their welfare.
So it's not that you have just drifted apart.
And I think it's entirely wrong for kids to brought up with 'this adult says it, so that's what happening and that the end of it'
Sounds like you are all just living in his world and only do things if he let's them happen.
Has it ever occurred to you that heay also be cheating?