"I'm just lost in the middle right now.' Sounds like you may be thinking that if he 'just' sorts out the 'issues' with the mother of his child, his previous partner, he'll see the light and get back on track for house, marriage, children with you. Listen to what he is telling you, OP: he doesn't want more children, he doesn't want to marry.
Look, there is one possibility: I was married, had a child with that man, husband died. Met a wonderful man, wanted to marry him and provide a secure future for my son. But he was reluctant to take on the responsibility of marriage and a child. So I left, moved abroad to take up a good job opportunity and give my child the chance of a bilingual education. At which point, my lovely bloke realised what he'd lost and decided he did want marriage and to become the legal father.
12 years on we're very happily married, great family life. So if you really want this bloke, I suggest you leave. If he wants you, he'll come after you on your terms. But right now, you are providing everything he wants by staying.
Right now, you are wasting your 20's on someone who doesn't have the same goals as you. Oh, and I did that too! That's why I refused to do it again.
You've come on here for advice, OP: can you take it?