The evidence does point to the latter. The stuff about the ex, the threats, it's all there.
I don't doubt he thinks he does love you, but I think he has that confused with 'need' he has a NEED for a family, and one of his own. I can't see anywhere in all this that he's thinking of your feelings.
I can see you only thinking of him, because he's demanding you to. Gradually now, you are beginning to think about YOUR thoughts and feelings, and those of your DC you already have.
It's good that this is a LDR, cos at least you do have the space to think.
Your relationship is in no way ready for the 'having a baby' conversation. You need to be 100% sure of him, and I don't think, given his behaviour, that you can be.
The most responsible thing to tell him now is 'Not Now.' And at the moment, if he pushes you, or threatens you, the answer is a flat No. If he wishes to ignore your right to decide, your right to wait, then that's not on.
You owe him nothing, except honesty. If you don't want any more DC, that's your decision. If he wants to make it a dealbreaker, that's his decision.
It really IS that simple.
Things happen for a reason. This man is a transition, you've learned all you can from him. Next one will be better. Please don't stay on for the sake of a year, it's nothing. There is no such thing as a relationship investment.