What’s morally right, I wonder? Genuine question. You got pregnant by accident, and he was totally clear that he didn’t want this baby and didn’t plan to help - you posted on here when pregnant that you knew you were going to be a single parent.
So, any man who has sex risks a baby, as he knows it’s not his choice to terminate, even if he’d prefer that. Every man knows contraception can fail, and he turned down his choice to double up. So if you take the risk, you take the consequences. But what morally should his consequences be? Financial, absolutely. But how much time? Is he morally compelled to take the baby he doesn’t want along on his swimming trip - when that baby won’t know they’re left out? Does he have any moral obligation to give you a break to have time with your two? They’re not his, and he didn’t want this one.
Don’t get me wrong - he’s an arsehole. He’s taking boyfriend benefits from you, and giving you less back than I gave women I barely knew, from baby group. Meaning, a bit of baby sitting for free to help out.
But morally, I’m more outraged that he’ll take sex and meals from you without helping you out, than I am that he won’t help with a baby he said he didn’t want.
And that then comes back to your choices… you let him swan in for a shag and a free meal, but expect nothing back from him.
Get rid, get the CMS claim in, and embrace being a single parent.