He’s just blowing smoke up your behind. Get a lawyer. Get a temporary support order.
How much in money and assets are we talking about here? Rough estimate? How much equity in the house? How much was there in savings? How much will he get with his pension and how far off is that?
Frankly the fact that he never put your name on the savings account even though he put your funds into it too is a HUGE red flag.
But looking at the total financial picture can give you a better idea of what’s worth fighting and what isn’t. If there’s $100k in house equity you need to fight for that; if it’s only worth 10k over what you I’m paid for it it may not be worth the fight. Did he spend $5k in savings to pay off his credit cards or $50 k? Is his pension worth $600 a month or $6,000?
Don’t let him gaslight you, just tell him you’re not asking for anything the law doesn’t say is yours.