'Dear, could you ask your boyfriend a teensy weensy favor...?'
Bruce would say no, because it would break the Bat/Bruce separator line, Diana have trouble with the concept of secret identity, they'd have a fight, possibly make-up, and go on from there, each mentally, subconsciously adding to the tally of "I'm not happy in this relationship." Eventually, that list gets too long for one or both of them, and they end it. Their friendship is always slightly awkward afterwords, and months, maybe years later, they'll keep wondering "What the hell was I thinkin?"

I don't like seeing painful romances that are doomed to failure and kinda fail whilst their occurring.

Aaron "The Mad Whitaker" Bourque; having seen these sorts of things in real life (they burn brightly but quickly, and in the end, no one's happy)