There is an expression in English of sort of dramatic frustration, but in a very familiar, and almost endearing way. So, for example, if your girlfriend/boyfriend does something that is kind of unique or strange, but it is very specific to them, you can exclaim, "What am I going to do with you!"
It is hard for me to explain this expression, and I cannot find a good webpage for it. But I am looking for a way in Chinese to sort of "mock complain" about something slightly weird that someone you care about does. Do you have any thoughts?