Tiger, that is most definitely your decision. I would discuss the finances , so you are both on the same page.
Whether he considers you "broken up" or not he is the breadwinner and you are married! Whatever the budget was before, should be in play now.
If there has not been any issues with spending before, then this needs to be addressed in a calm matter of fact way. Perhaps if you write up a budget and present him with a copy. Show the expenses for your son, household, gas, and toiletries. If he is dining out or spending on trips, gifts, this needs to be addressed. You should be able to the movies, events , and have a clothing stipend , especially if you are going to work.
He may choose to believe you are roomies, but you are not and there is a fiduciary responsibility to you and your son.
Formerly Workinprogress H :55 M :over 29 yrs. Together : 33 D : college D : adult BD and left : May 2013 Separated Experimenting/Replay