Who cares if he blames you? Blames you to whom? Who even cares? Who is that entity that would be effected by his blaming you? Work place? Family? Who cares?

Do not give him any money! You just gave him 900 all while he still owes you money, at the very least you could subtract that amount. You took a bank loan for him too? Did you give him a check for 900 now or cash? If a check or money transfer or bank transfer, call your bank and ask to put a stop to it ASAP. You can stop that check right now

Just file for divorce and things like bank loan he owes you could be addressed with your lawyer. These things need to go through lawyers now including deposit you need to give back or money he owes you. Do not do any of these things now. Include this in divorce papers. No direct transactions. He could even claim you never gave him deposit back and 900 is just a gift from you. All of this must go through court orders at this point.