Ok you need to wake up sharpish. Any man that takes money from your parents, sends money without telling you (they call it stealing in this country), hides money in cash and calls you a bitch IS NOT HONEST.
If you want to end up poor keep going how you are. Move out with none of the money. Wait for a divorce settlement. Don't get any record of a loan from your parents - instead it's a gift! To him. Don't worry about the joint account or his moving money to his mum.
Stop and think. Do not say a word to him. Please please say nothing. Or else all the cash and joint account money vanishes in a puff of smoke.
He came into this marriage with nothing. Half of the cash, the bank accounts and the house are yours - and the loan to your parents needs to be repaid. They money to his mum should come out of his share. Actually the cash belongs to HMRC but they won't get it from him. He will western union it out and probably already has sent loads.
And if you think he will ever hand any of the joint assets over you are mad. He will send it to his mum to look after and you will have to pay very expensive solicitors a lot of money to not get it back. He will refuse to sell the house or sell it to a mate/relative for nothing. He will refuse to do viewings and if you stop paying it will be your credit rating fucked not his.
He doesn't love you. You are a stupid spoiled rich white woman to him. A source of a passport, a servant and someone to pay the bills. You are a mark. A trusting mug bought up in a family that simply doesn't know how bad people can be. A gullible and naive person that will soon become disposable when they start telling him they know what's going on.
The only way you are getting out of this is firstly by seeing a solicitor and making sure you take EVERYTHING you are entitled to but just stay on the right side of the law - in terms of what can be proven.
Fuck knows how you are going to do the house. He won't sell it that's for sure. As for the cash - take photos. You might be able to threaten him with HMRC. Who have considerably more power and willingness to go after him than the police or family courts.