My Boyfriend is Putting his Family First

I have been with my boyfriend for the past 10 yrs and we are now leaving together. The only problem is he does not trust me at all. I dont ask him for anything at the end of the month regarding money matters but every month he gives his savings to his sister to put in the bank rather than doing it himself and this tends to offend me as his family is aware of his family matters whereas im left in the dark. I do not want to take charge of his money but he needs to keep his family out of his financial matters and be more responsible. When i try to talk to him about this he gets all defensive and says that i am jealous. Am i overeacting or does he need to change his attitude?

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