Long back story, I'll try to condense it down. My DH until 6 months ago was emotionally abusive. He was having some difficulties (family & work) & seemed to use me as his emotional punchbag. For over a year he was awful to be around, ignoring me, name calling, criticising me constantly & making me generally feel like shit 
He is now in anti depressants & has improved greatly. The effects of this behaviour on me have been huge & im not sure whether I'll ever be able to forgive or forget, time will tell.
Before he started acting that way I took out a large loan for him in my name (unpaid tax bill from before I met him!) which tbf he pays every month with no quibble.
He now wants me to increase the loan so he can get a new car. I have no interest in this as the car we have is fine
. Because of his behaviour & the vulnerable position I'm in I've asked him to sign something to say this is his responsibility/nothing to do with me so in the event that he has another episode/leaves me I will not be responsible for this large amount. He has agreed BUT in return he wants me to sign something to say the money we have in savings will all be his!! (I won't agree for the savings to be used for a new car).
I know that if he was to go back to acting how he was previously I would not be able to stay so would be worried that I would be in a financially precarious position. (Have 2 small DC).
Hope it's not too confusing!