I agree, don’t marry or have children with him. It doesn’t sound like you have anything to work with. Is any of this relationship acceptable to you?
The thing about marriage… most men know that many/most women see it as a sign of their commitment/love - and for healthy couples, it is both those things, and more! But for abusers, it’s another tool to control others with. It is hard to accept people we love don’t always have our best interests at heart, which part of is why you’re confused about him offering marriage.
In any case, with him, marriage is a trap! Don’t fall in.