J.S.
My ex is a tool, would not have bothered me. I would have just looked at is as helping the child get to college and let it go
Looking at some of the answers this would be his financial information as well? Not his fault that being married makes it joint information. You should not feel you have control over your old tax filings, they are his too or he wouldn't need them. So much anger in some of these answers. If he had any sense he could get the same information from the IRS, it isn't yours to control. All you were doing by giving it to him is making sure he met the deadline for her filing.
Look at it this way, soon the divorce will be final and your finances severed, no more of this to worry about.