OP, just because women in your culture get married and have babies young doesn’t mean that’s what you have to do.
You are your own person, not an offshoot of any culture.
It’s understandable that having lost a baby, especially so far into a pregnancy, that you would feel the urge to be pregnant again. It’s natural even.
But the reality is that you shouldn’t be having another baby just because you lost one, however normal that seems to feel to you now.
This man is 23. It’s possible that he isn’t up for being a part of the cultural norms of getting married as he’s actively said he doesn’t want to get married. that in itself isn’t wrong. but his abusing you during your last pregnancy and then only coming back after you’d lost the baby says everything about the kind of person he is - and isn’t - all in one breath.
On the face of it, having a baby at 23 isn’t the end of the world. My parents had me and my sibling at 20 and 23 respectively, in fact it was the done thing back then.
But equally you still have your whole life ahead of you. To find a career, to live your life, without the trappings of children.
Because as much as you want a baby now, you shouldn’t want being a mum to be your sole focus in life. Because those children aren’t always going to be children, and then you will need other things to occupy your time and focus.
Live your life for now. Get rid of the boyfriend, he’s bad news, even if you decided not to have a baby yet.
You have plenty of time to meet someone, to settle down, to have children ultimately, but for now concentrate on discovering yourself, because it sounds as if you’ve been trapped in the expectations of your culture, marry, have children, live at home, forget all that, and think about what yu could be, and then, and only then, start thinking about future baby plans.