The main reason why your husband gave you this task is because he trusts you. In my opinion, this is actually a milestone in a relationship. Money shouldn't be a big thing, but we can all agree that it is very important. Your husband gave you this duty because he believes in you. Now, if you don't feel comfortable with that, talk to him about it. Let him know how you feel about doing all the budgeting. Let him know your worries so you two can come up with a solution. Just because he gave you that task, it is yours alone. You can compromise and ask him to be there with you when you budget all your expenses so you won't have a hard time telling him why it's like that -- because he'll be there with you through the process :)
He gave you that task because he knows you can do it. Don't just shrug it off. At least try to talk to him about how you're feeling about this new task so he can also make adjustments for you. Communication is key :)
Hope this help!
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