I don't think you should mention anything about his reasons for being in the bar or who he may have been with. I think you should just say something about the amount and that you're worried it's not something that you can afford. Possibly bring up canceling that account and getting one of your own. It'll take a lot of stress off of you in the long run not only financially but you won't have the statements making you wonder who he's with and what he's doing.
