Sorry OP, I was busy this evening and have only just seen your reply to my questions. They were rhetorical really, to get you to think about those issues. As are these below, so you don't need to answer them here.
How much do you know about your financial situation? Does he keep this information 'for his eyes only'? Do you have a joint account and joint access to online banking, cards etc? Does he pay all the bills from the money you give him? What do you/are you allowed to keep for your own pocket money? Does he consult you on big purchases? Why have you got into debt? How much is in your or joint names? How much debt is there overall?
You oblige him with sex and he is nice to you? You don't, and he isn't. Is this how you want your life to be? Sex as a bargaining chip, and sulking/abuse when he doesn't get it. This sort of coercion is a form of sexual abuse.
You work 1/5 and presumably he works 5/5. So you do 20% of the work he does. Does he do 20% of the household chores you do during the week? And of course 50% of the weekend chores when you are both off work?
He babysits his own children so you can do things. I bet it's mostly work or chores, isn't it? Does he do the weekend and evening share of childcare? Putting them to bed, bathing, stories, cooking dinner, play, homework, etc? I expect not. Does he do packed lunch for school, remember to fill in that slip for a school trip, wash sports kit, take kids to parties, buy presents and wrap them, wash school uniform, etc etc?
And he doesn't like being accountable to you. Or giving you the courtesy of informing you he will be home late. So basically, he lives just like a single person then. A stroppy entitled teenager with no responsibilities.
What are YOU getting out of this relationship?
He does not show you any respect at all. He is not a life partner or a good father, is he really?
You don't need to answer any of the above here, but ask those questions of and for yourself.
much love 