You can't stop him from spending money while you and he are married: either spouse can spend whatever they like, on whatever they like. This why some spouses have savings depleted by gambling, others by excessive shopping or by a spouse giving his/her money to a hardluck relative or a charitable cause or religious institution. If you divorce him and get an order dividing assets or entitling you to some level of support from him, that will help control his spending and insure that you get some assets or money, but outside of a divorce, where assets are divided and support ordered, the law does not intervene in spending.