OP this is going to sound harsh, he doesn't want you for whatever reason and as a result he doesn't want a child with you because he'll feel linked forever with you. It's exactly how my uncle felt, which was why the wanker ran out on my aunt when she had a baby and why he never sees her or pays for her. He's put up a wall and broken that link.
Your ex-partner doesn't want you in his life in any way and he knows that with a baby you will always be tied together- he will have to pay maintenance, or even if he ignores will at least be hassled by the csa, if his family find out they might also want to meet their new relation...do you see.
It's shitty but that is the reason, he wants a complete break. He can't have that if you choose to keep the baby, that decision is yours though-not his. Just don't expect him to suddenly want you or the baby once it's born because you'll be wasting your time and hurting the both of you.
People are understanding you, i just don't think you want to acccept the truth I expect you want to have him say the words 'i don't want this baby' because you are hoping he will change his mind. And maybe a part of you wants closure on that. Actions speak louder then words though OP and his actions say 'leave me alone, I want nothing to do with you both'.
You need to stop texting him, that's just fueling his behaviour and hurting yourself. If someone doesn't want to do something then constantly persistent communication can make you more stubborn in sticking with your belief. From his pov, he probably feels very harassed and less likely to want anything to do with you. He's a wanker OP but that doesn't sound like it's going to change any time soon so you need to think on yourself.
Do you want this baby? If so you need to think like a single parent and start looking into the help that's about and preparing to do it alone. Also, stop texting him, decide what you want to do and go NC, let him approach you to find out what's going on but contact csa for monetary support.