OP - my daughter had her first at 22. This was due to the fact that (with hindsight) no (female) contraception method appears to work.
She went on to have a second, and when she became pregnant with a third immediately afterwards, the thing she was living with turned around and said get rid or I'm gone.
He went 🥳
She works (always has done) and has a beautiful, immaculate 4 bedroom home (we helped her with a loft extension). I look after her children whenever she wants. She occasionally goes out with friends and has a great time (three/four times this year).
Her oldest is now 8 and her youngest is just about to turn 4. Her youngest has epilepsy and she copes marvellously and fights for him all the way. She just threw a huge Halloween party for all the children's friends who live close by.
She is the most fantastic mum, giving her children a fantastic time. They do not miss out on anything. They have more than a few positive male role models (infinitely better than the low life who upped and left) and they are particularly close to their grandad. They attend music, gymnastics and football clubs and go out on trips together most weekends.
Those people labelling your situation a 'shit show' should hang their heads in shame.
Single mothers are the strongest people because they have no choice and get on with loving/raising their children because they have to. Their partners???? leave/abandon the children they have created because they 'want to', and simply because they 'can', and don't even look back, they are the ones that are the 'shit show'.
Men who abandon their children are the shit show!
My grandchildren's lives are enriched because the shit show (who never spent time with the children ever because he was always so engrossed with his precious hobby of cycling when he wasn't working) ceased the moment 'he' buggered off. They're all infinitely better off without that poor excuse for a human.
OP - you don't need him, he's using these circumstances just as a feeble excuse to leave. Let him. Don't ever allow any man to threaten you. If he can threaten you, he doesn't love you.