Quoting ❥New Beginnings:" Would You be mad at your SO if they gave money to a homeless person without your consent? For example ... [snip!] ... saving money for a bus ticket and a night in a motel room and is only $8 short. So your So gives her $10. Would you be mad?"
Are you upset with your SO for giving the $$? Is it because funds are tight in your home and you feel that he should have talked to you first? If funds are tight in your home and he freely gave away $10, I can see why you would be irritated. $10 isn't alot but it can mean a few gallons of milk for kids or something so I would understand that. In my position, I wouldn't be upset.