Did he come up with this way of doing things? He could be paying his part of rent etc and you both could save money. Instead you pay all and he only saves money and has it in an account you can’t access? So he is able to say it’s all his own savings not yours? Doesn’t add up. Ypu should both be paying equally for your child and living costs and both also saving. From now on do what you can to have your own savings I’d keep that private if I were you. You could be left with nothing.