I think that explains why you stayed together with her 3 months afterwards...

Contrary to popular belief, it is (was possible in the case of the Russian Tea Room) to have a not too expensive dinner at Tavern on the Green. You might actually have been better off.

As for a pick of restaurants, one word: Zagat's. Come to think of it, if you didn't know that she had chosen an expensive restaurant, you could have called them and asked what their price range was before that night, cancelled and chosen a different place.